What’s the Plural of Hippopotamus?
The short answer is that both hippopotamuses and hippopotami are correct plurals for this barrel-bodied and rotund mammal: the hippopotamus.
The short answer is that both hippopotamuses and hippopotami are correct plurals for this barrel-bodied and rotund mammal: the hippopotamus.
Aircraft is the same in both its singular and plural noun form. Both are aircraft.
As a general guide, beer (no -s) is most often the plural of beer. When referring to varieties, or types of beers, the standard pl. n. is acceptable.
The plural and singular of series is series. Series already refers to a number of things, and so it stays the same either way.
Software is a mass noun that only has a singular noun form. Whether we use it as a singular or plural, it stays “software”.