None. Only 1 exists.
The plural form of him, her, or it is them. (objective pronouns)
"Groceries" is the plural form of "grocery."
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of the demonstrative pronoun 'that' is those.
The plural form of the noun 'spaceship' is spaceships.
The plural of organ is organs.
There is no plural form for the word, countries. This word itself is a plural.
The plural form of parenthesis is parentheses.
The plural form of vita is vitae.
The plural form of rung is rungs.
The plural form of plaintiff is plaintiffs.
the plural form of friction is friction