peanut worm(n = noun.animal) sipunculid - small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut;
is a kind of invertebrate
is a member of phylum sipuncula, sipuncula

annelid worm, army worm, beard worm, bladder worm, cabbage worm, dew worm, fishing worm, grugru worm, guinea worm, guinea worm disease, hair worm, hog peanut, measuring worm, nematode worm, oligochaete worm, palolo worm, parasitic worm, peanut, peanut bar, peanut brittle, peanut butter, peanut gallery, peanut oil, peanut vine, polychaete worm, polychete worm, potato worm, proboscis worm, railroad worm, red worm, ribbon worm, segmented worm, spiny-headed worm, tomato worm, tongue worm, trematode worm, velvet worm, vinegar worm, wild peanut, worm, worm eaten, worm family, worm fence, worm fish, worm gear, worm genus, worm in, worm lizard, worm out of, worm salamander, worm snake, worm wheel