Synonyms for Speck (same or very similar meaning)
WordNet sense 1 ((nontechnical usage) a tiny piece of anything):
atom, corpuscle, molecule, mote, particleWordNet sense 2 (a slight but appreciable addition):
hint, jot, mite, pinch, soupcon, tinge, touchWordNet sense 3 (a very small spot):
pinpointFrom the ODE community, based on WordNetadd/edit