Possess is a verb. Its plural form (the one used with plural subjects) is possess, while the form used with singular subjects is possesses.
Examples:
We possess, they possess.
He, she or it possesses.
The noun form of possess is possession, plural possessions.
It is a verb, not a noun, so possess is already the plural form. Possesses is the singular verb form. The verb pluralization rules are opposite the noun pluralization rules that most know.
"He possesses." <-- Singular
"We possess." <-- Plural
Possession would be the noun form, and the plural of possession is possessions.
"This watch is my most prized possession." <-- Singular
"The fire took all of our possessions." <-- Plural
The plural form of quiz is quizzes.
The plural form for the noun index is indexes.
The plural of colt is colts
Plural of zero is zeroes.
Chests is the plural of chest.
The plural form of him, her, or it is them. (objective pronouns)
Italy does not have a plural form.
The possessive form of the plural noun traditions is traditions'.Example: These traditions' origins are centuries old.
The plural form of beauty is beauties.
The plural form is spelt : subpoenas.
The plural form of quiz is quizzes.
The plural form of radius is radii.
Trout is plural
The plural of dish is dishes.
The plural form of "foot" is "feet."
The plural form of the noun 'sea' is seas.
The plural form for the noun coach is coaches.