THESAURUS
flyspeck
ace, atom, bespeckle, bespot, bit, bloodstain, blot, blotch, blur, brand, crumb, dab, daub, dole, dot, dram, dribble, driblet, drop, droplet, dwarf, eyesore, farthing, fleck, flick, fragment, freckle, gnat, gobbet, grain, granule, groat, hair, handful, iota, jot, little, little bit, macula, maculate, maculation, macule, mark, microbe, microorganism, midge, minim, minimum, minutia, minutiae, mite, modicum, molecule, mote, nutshell, ounce, particle, patch, pebble, pinch, pinhead, pinpoint, pittance, point, scrap, scruple, smear, smidgen, smirch, smitch, smouch, smudge, smut, smutch, snip, snippet, spatter, speck, speckle, splash, splatter, splotch, spoonful, spot, stain, stigma, taint, tarnish, thimbleful, tiny bit, tittle, trifling amount, trivia, vanishing point, whit