Is birds wings a pronoun?

No, both 'birds' and 'wings' are nouns, the plural form of the nouns 'bird' and 'wing'.

A pronoun is a word that takes the place of a noun in a sentence. The pronouns that take the place of the nouns 'birds' or 'wings' are they as a subject, and them as an object in a sentence.

If you are trying to say 'the wings of the bird', then the noun 'bird' must be in the possessive form to show that the wings belong to the bird: the bird's wings.
Or, if you mean 'the wings of the birds', you need the plural possessive form for the plural noun birds: the birds' wings.