Earlier today I tried to tag a question "nouns", and the system wouldn't let me, saying that the tag noun already existed.
Just a minute ago, I wanted to tag another question "adjectives", same problem: adjective already exists.
I am used to the plural form from other SE sites — ELU, GLU, and Linguistics. Their corresponding meta threads are:
- ELU: Should we prefer singular or plural in tags?
- GLU: Should tags be pluralised?
- Linguistics: 2 questions about tags
I propose that we prefer the plural form on ELL as well. (The singular forms would still exist as automatically remapping synonyms.)
I did see the general discussion good names for tags, which (by virtue of it being general) has some overlap with this one, but I think this issue here is rather tiny and can be singled out and dealt with swiftly.