Synonyms and related words :
babe, boob, child, child of nature, chump, cinch, credulous person, cull, dove, dupe, easy mark, easy pickings, fall guy, fish, fool, gobe-mouches, greener, greenhorn, greeny, gudgeon, gull, hick, infant, ingenue, innocent, lamb, leadpipe cinch, lout, mere child, monkey, noble savage, oaf, patsy, pigeon, plaything, prize sap, pushover, rube, sap, saphead, schlemiel, simple soul, sitting duck, stooge, sucker, toy, trusting soul, unsophisticate, victim, yokel