(interrogative) what / (literary, relative) that, which

that

as for (regarding; about) / with regard to, as regards, in regard to / with respect to / in relation to, with reference to / in the matter of

as for, as to (regarding; about)

or something, perhaps, maybe, as if (or something like that - usually used in a question)

what, what kind of, what sort of / what a/an [insert noun]; what a/an

(indefinite pronoun) something

(colloquial) somewhat, slightly, to some extent / (colloquial) for some reason / (colloquial) approximately, roughly

(indefinite pronoun) anything

because