Is it poems or poem's

Answer 1

Poems is the plural of poem. The form poem's is a possessive form (genitive) or a contraction with the verb is. Plurals are NOT formed with an apostrophe.

The apostrophe marks either a genitive form or an ellision, i.e. when the 'i' of 'is' dropped and 'poem is' is contracted to 'poem's' as in "This poem's the best I've ever read".

The genitive form is either singular or plural. 'The form of the poem' could be written as 'The poem's form', while 'the form of the poems' would be 'the poems' form', with the apostrophe coming after the 's' in the plural.

Examples :

The poem is in the book of poems. (singular and plural)

The poem's form is unique. (The form of the poem is unique.)

The poems' author is unknown. (referring to a group of poems)

This poem's very interesting. (This poem is very interesting.)

Answer 2

"Poems" is the correct plural form of "poem." "Poem's" would be the possessive form, indicating something belonging to a poem.