What is another word for "thumb"?

Roget's Thesaurus (1911) lists these synonyms for "thumb": adventure, aim, antenna, attempt, best, bold, chance, coup, debut, empirical, endeavor, essay, exertion, experiment, experimental, experimentally, feel, feeler, feeling, finger, forefinger, fortune, fumble, grabble, grope, hand, handle, hard, lambent, luck, make, manipulate, manipulation, massage, may, non, one, out, over, palpability.