Synonyms for Fleck (same or very similar meaning)
WordNet sense 1 (a small fragment of something broken off from the whole):
bit, chip, flake, scrapWordNet sense 2 (a small contrasting part of something):
dapple, patch, speckle, spot, maculationWordNet sense 3 (make a spot or mark onto):
blob, blotFrom the ODE community, based on WordNetadd/edit