THESAURUS
ace, atom, bit, dab, dole, dot, dram, dribble, driblet, dwarf, farthing, fleck, flyspeck, fragment, gobbet, grain, granule, groat, hair, handful, iota, jot, little, little bit, lota, minim, minimum, minutiae, mite, modicum, molecule, mote, nutshell, ounce, particle, pebble, pinch, pittance, point, ray, scruple, smitch, speck, spoonful, spot, thimbleful, tiny bit, tittle, trifling amount, trivia, whit