com/definition/english/all , "all" is a pronoun in such cases (the analogous example sentence there is "we all have different needs"). In "bathing suits", "bathing" is an attributive noun (suits used for the activity of bathing). "bus driver" is a compound noun, consisting of noun + noun.
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ShaNapIn the sentence:We all took bathing suits to the beach.What is the part of speech of all?The Shorter Oxford calls that an adjective. Talk about experts disagreeing. I pity English grammarians.
enoonThe Shorter Oxford call that an adjective.Do they give an example sentence?
GPY enoonThe Shorter Oxford call that an adjective.Do they give an example sentence?Not one exactly on point, but from Keats, "They are all here tonight."