The slang term "ex" (as in ex-spouse) forms the plural "exes", although neither is formal English.
The plural of ex is exes.
The plural way to spell studio is studios.
The plural is cherries.
The plural is resources.
The plural is cantaloupes.
The plural is hooves.
The plural is roses.
The plural is "emeralds."
The plural is bridges.
The plural is a regular S plural, instruments.
The plural is a normal S plural, races.
The plural is a normal S plural, associates.