The Collaborative International Dictionary of English v.0.48:
Nibble \Nib"ble\, v. t. [imp. & p. p. Nibbled; p. pr. & vb. n.
Nibbling.] [Cf. Nip.]
To bite by little at a time; to seize gently with the mouth;
to eat slowly or in small bits.
Thy turfy mountains, where live nibbling sheep. --Shak.
Moby Thesaurus II by Grady Ward, 1.0:
45 Moby Thesaurus words for "nibbling":
appetite, cannibalism, carnivorism, carnivority, carnivorousness,
chewing, consumption, cropping, deglutition, devouring, devourment,
dieting, dining, eating, epulation, feasting, feeding, gluttony,
gobbling, grazing, herbivorism, herbivority, herbivorousness,
hunger, ingestion, licking, manducation, mastication, messing,
munching, nutrition, omnivorism, omnivorousness, omophagy,
pantophagy, pasture, pasturing, pecking, regalement, relishing,
rumination, savoring, tasting, vegetarianism, wolfing