Synonyms and related words :
abdomen, anus, appendix, blind gut, bowels, brain, cecum, colon, endocardium, entrails, foregut, giblets, gizzard, guts, heart, hindgut, innards, inner mechanism, insides, internals, intestine, inwards, jejunum, kidney, kishkes, large intestine, liver, liver and lights, lung, midgut, perineum, pump, pylorus, rectum, small intestine, spleen, stomach, ticker, tripes, vermiform appendix, viscera, vitals, works