No, the word theirs is not a noun. the word theirs is a pronoun, the third person, plural, possessive adjective; a word that placed before a noun to describe that noun as belonging to two or more people or things. Example:
I know where they live. Their house is on this street.
The possessive pronoun 'theirs' is the pluralform, which takes the place of a noun belonging to a plural noun or two or more nouns.The singular possessive pronouns are mine, yours, his, hers, its.Examples:The Longs live on my street. The house on the corner is theirs.Jack and Jill live on my street. The house on the corner is theirs.
In general, to form a singular possessive of a noun, one adds "'s" to the word, as in "Bob's." By contrast, possessive pronouns never take apostrophes - its, his, hers, theirs, etc.
"Firefly's" is a singular possessive noun.
The singular possessive noun is stepchild's.
No, "tomb" is a singular common noun, not a possessive noun.
The singular noun is tooth.The singular possessive noun is tooth's.
The singular possessive form for the noun clock is clock's.
The noun vest is the singular form.The noun vest's is the singular possessive form.
The singular pronoun "she" has the plural "they."The singular possessive is her or hers and the plural possessive is their or theirs.A possessive adjective is a word that is placed before a noun to describe that noun as belonging to someone or something. The plural possessive adjective for "they" is their.Example: Those are their books.A possessive pronoun is a word that takes the place of a noun that belongs to someone or something. The plural possessive pronoun for "they" is theirs.Example: Those books are theirs.
The plural personal pronoun for the singular "he" is "they."The singular possessive is his and the plural possessive is their or theirs.A possessive adjective is a word that is placed before a noun to describe that noun as belonging to someone or something. The plural possessive adjective for "they" is their.Example: Those are their books.A possessive pronoun is a word that takes the place of a noun that belongs to someone or something. The plural possessive pronoun for "they" is theirs.Example: Those books are theirs.
No, "she's" stands for she is. The singular possessive noun for a female is her or hers.
The singular possessive noun of grandmother is grandmother's.