Ebony is a color, and an adjective. It does not have a plural.
Used as the name of a dark wood, it might rarely be seen as "ebonies."
The plural form of quiz is quizzes.
The plural form for the noun index is indexes.
The plural of colt is colts
Chests is the plural of chest.
Plural of zero is zeroes.
Italy does not have a plural form.
The plural form of him, her, or it is them. (objective pronouns)
The plural form is spelt : subpoenas.
The plural form of beauty is beauties.
The plural form of radius is radii.
The plural form of quiz is quizzes.
Trout is plural
The plural form of the noun 'sea' is seas.
The plural form for the noun coach is coaches.
The plural form for the noun index is indexes.
The plural form of "atlas" is "atlases."
The plural is Tuesdays. No apostrophe.