Should tags of nouns be plural or singular?
Real example: pumpkin vs. pumpkins
If the answer is: "Doesn't Matter", then do we connect the singular and plural versions as synonyms?
Plurals sounds more fitting.
Even if the question mentions the singular, or talks about a single instance, you'll want to group that with other questions on the same topic. And you'll be referring to the plural form to do so.
Read the difference:
The ear and eye just wants to go with the latter.
This was discussed on meta.cooking, here's some of what I've found revisiting it:
Plural vs. Non Plural
Plural should have preference unless a collective noun is more appropriate.
To make it easier to think about, use the tag in this sentence: "this question is about [tag-name]". It's obvious that "cookies" is better than "cookie". However, it's not so clear that "avocados" is better than "avocado".