WordNet sense 1 ((often followed by `of') a large number or amount or extent):

batch, deal, flock, heap, lot, mass, mess, mint, pile, plenty, pot, raft, sight, slew, spate, stack, wad, hatful, mickle, muckle, good deal, great deal, quite a little, tidy sum, whole lot, whole slew

WordNet sense 2 (kiss lightly):

smack

WordNet sense 3 (hit lightly with a picking motion):

beak, pick

WordNet sense 4 (eat by pecking at, like a bird):

pick up

WordNet sense 5 (eat like a bird):

pick at, peck at

WordNet sense 6 (bother persistently with trivial complaints):

nag, hen-peck