My first reaction to aircrafts was to think it was a typo, but I just checked usage on NGrams... ...and compared it to usage for the singular / collective noun form aircraft... ...which seems to ...
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 ...
In math, we use the term series a lot, and there are many types of series. How should I craft my sentence when I have three different ones in mind to talk about? Should I settle down for a less ...
Possible Duplicate: Irregular plurality situations in English 'sheep, deer, fish' are some of a row of animals where singular and plural have the same form, i.e. the plural (normally) has ...
Why do some nouns in English not take the plurality suffix in the plural form? Could you give me a list of plural nouns which don't take "-(e)s" suffix? For example, I know about "fish" and "sheep".
Is there a term for nouns that have identical singular and plural forms? For example, sheep fish glasses aircraft/spacecraft etc.