WordNet sense 1 (the thick short innermost digit of the forelimb):

pollex

WordNet sense 2 (a convex molding having a cross section in the form of a quarter of a circle or of an ellipse):

ovolo, quarter round

WordNet sense 3 (look through a book or other written material):

flick, flip, leaf, riff, riffle

WordNet sense 4 (travel by getting free rides from motorists):

hitch, hitchhike

WordNet sense 5 (feel or handle with the fingers):

finger