Lang-8 is a website where you can write a journal post in English, and have your entry corrected by native speakers of English.
In return, you're encouraged to correct journal posts written in the language that you're a native speaker of.
(Declaration of interest: I'm a user of the site) Update: It is shutting down
Italki is another great language exchange ...
Dictionaries are useful for finding definitions, spellings, pronunciations, and usage examples.
English learner's dictionaries, as their name indicates, are focused on the particular needs of English language learners; they may have fewer entries than other dictionaries, but usually provide more extensive examples, usage ...
The Cambridge Guide to English Usage by Pam Peters
Practical English Usage by Michael Swan - A popular pedagogical grammar. It's informed by modern linguistic analysis, but it's presented in a way that is useful for learners. It's also available online.
A Practical English Grammar by Thomson and Martinet
Essential Grammar in Use with Answers (...
BBC Learning English Doesn't attempt to cover everything, but the things it does cover are nicely organised into "bite-sized chunks" that you can easily dip in to without getting bored or overloaded.
The English Club - "everything from grammar for learners to worksheets for teachers, including fun pages like games, videos, quizzes ...
The English Blog Internet resources, reviews, news, tips and trivia for teachers and learners of English.
Caxton. Mostly language, but not always
Common Errors in English Usage
I Study English lists a lot of vocabulary words
Grammarist Grammar and usage
Literal-Minded. Linguistic commentary from a guy who takes things too literally
I have a couple suggestions:
Ask in our chat room, like FumbleFingers suggested. A lot of us would be happy to help, as long as we aren't answering this sort of question day in and day out :-)
Try a site like Lang-8 or their Q&A site HiNative. As I understand it, you can post about whatever you want on these sites, so these sorts of questions will ...
Many Internet dictionaries provide recorded pronunciations: Oxford, Cambridge, Collins, Macmillan, Merriam-Webster, Wiktionary, and others.
There is also Forvo.com, which allows you to enter a word and hear it pronounced by everyday people. While dictionaries usually have more "neutral" pronunciations, Forvo can be good for letting ...
Wordly Wise 3000 – Learn more than 3000 advanced words (good for SAT).
The General Service List – The most common 2284 English words.
Spelling Through Morphographs by Robert Dixon and Seigfried Engelmann. Designed as a one-year supplement to an English class for students who are already familiar with English. Teaches the prefixes, roots,...
Exchanging online with a partner
Learn a Lang Discord Server A voice and text server where people learning different languages can talk to each other. You must indicate your native language to get access to all of the channels, but otherwise it is free.
Italki This website features thousands of native English speakers who will do free language exchange with ...
British National Corpus (BNC)
Corpus Concordance English
Corpus of Canadian English (STRATHY)
Corpus of Contemporary American English (COCA)
Corpus of Global Web-based English (GloWbE)
Corpus of Historical American English
Google Books Ngram Viewer
Time Magazine Corpus
The dictionary site OneLook has search features like those. You can use wildcard symbols for letters, and limit the search to certain parts of speech as well.
Here's an example, using the parameters you put forth in your question (i.e., nouns containing exa).
For what it's worth, 36 words were found:
Alex, there are lots of such sites, just search in Russian for параллельные тексты на английском и русском and you are sure to find something to your level and taste.
Besides you can also find some theoretical support, pros and cons of the method. They say you should read only English texts after the intermediate level. Here's one of the sites: http://www....
I can recommend you the Corpus of Contemporary American English. A Corpus is a set of texts written in a certain language. You can find many of them online and they are a very good source of research for collocations, phrasing and word choice as native speakers would do. It's not a dictionary, though. I'm afraid you can find the words there and then, if you ...
iswearenglish - more than 2000 short videos for English learners
Stuff You Should Know - learn how different things work and learn English by the way
Master Spoken English - a series of videos to help master pronunciation
The other answers have pointed out COCA and OneLook, both of which are excellent resources. I'd like to add a few more:
OxfordDictionaries.com is a large dictionary that allows you to search for *exa* and shows matching headwords.
The excellent Longman Dictionary of Contemporary English lets you search for *exa*, but you'll notice it sometimes takes a bit ...
BITS English Language Learning - Site's purpose: to help students improve their listening and reading comprehension of the English language. English Language Learners will find many suitable audiobooks there.
Librivox - Public domain audiobooks read by volunteers, freely available
Wired for Books - on line educational project of the WOUB ...
As said by @Dan Brown, proofreading "is a lot of work, not particularly rewarding, and only ever helps one single person." This means you will get poor support, because native speakers won't have much incentive to open a dictionary to show you why this exact word doesn't work, unless you pay for professional editors.
You have to change your mindset from "...
Thesauruses (or Thesauri)
Note most dictionary websites contain a section that has a thesaurus. See Dictionaries.
Big Huge Thesaurus - includes similar terms. "sounds like" and rhymes as well as synonyms and antonyms. Entries are based on source data from the Princeton University WordNet database, the Carnegie Mellon Pronouncing Dictionary, and ...
Hulu - Streaming video site (within United States)
Netflix - Streaming video and movies site (may not be accessible in all areas)
BBC iPlayer - Streaming video and radio (within United Kingdom)
Anki is a spaced repetition flashcard program.
Artha, a free cross-platform English thesaurus that works off-line, and exists in portable (USB drive) version
HiNative, a mobile app with a community (also listed under Websites)
AFAIK, no. Japan has a national standard variety of Japanese 標準語, dictating and proscribing the accent and vocabulary, on which school instruction across the country is based, whereas English is more diverse. You can speak of GA, RP, and so on, but there's thousands of different English speaking traditions and varieties, with a multitude of different stress ...
This isn’t really the best site for that sort of question. Instead, I suggest you try Literature Stack Exchange. Make sure to look through their Help Center before posting, so you know what sorts of questions are on-topic or off-topic there.
Google News - Read and search articles from many newspapers
New York Times
Sydney Morning Herald - News about Australia and the world
Yahoo News - Read and search articles from many newspapers
The Guardian - News written in simple and clear English
The Wall Street Journal - Not necessarily the simplest English, but extremely well-written