adv. 25B6; preposition who did you ask besides Mary? : IN ADDITION TO, as well as, over and above, above and beyond, on top of; apart from, other than, aside from, but for, save for, not counting, excluding, not including, except, with the exception of, excepting, leaving aside; N. Amer. informal outside of; archaic forbye.
25B6; adverb
there's a lot more besides : IN ADDITION, as well, too, also, into the bargain, on top of that, to boot; archaic therewithal.
besides, he's a man : FURTHERMORE, moreover, further; anyway, anyhow, in any case, be that as it may; informal what's more; N. Amer. informal anyways.