The plural possessive form for comity (one m) is comities'. If you meant the noun committee, the plural possessive form is committees'. If you meant the noun community, the plural possessive form is communities'.
The plural form of the noun 'community' is communities.
The word community is singular; the plural form is communities.
The plural way to spell studio is studios.
The plural is resources.
The plural is cherries.
The plural is hooves.
The plural is roses.
The plural is "emeralds."
The plural is cantaloupes.
The plural of "bridge" is "bridges."
The plural of "frill" is "frills".