23
votes
2answers
4k views

Why is 'sheep' the same when talking about one or more than one?

I am trying to find out why sheep has the plural sheep. I have found different explanations, such as, "it is because they were seen as uncountable, as in 'a herd of sheep'", "because it comes from ...
15
votes
3answers
17k views

Is there a term for words that have identical singular and plural forms?

Is there a term for nouns that have identical singular and plural forms? For example, sheep fish glasses aircraft/spacecraft etc.