The plural is "conveniences", as in "The resort hotel had all
the conveniences of home, much to theri surprise".
What is the pluraln of aircraft?
The plural of aircraft is aircraft. Much like how the plural of
deer is deer.
(Singular: That is such a beautiful aircraft / Plural: Look at
all of those aircraft)
What is the plural possessive car?
The plural form of the noun car is cars.The plural possessive form is cars'.example: All of their cars' prices were much to high.