spiny-headed worm(n = noun.animal) acanthocephalan - any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines;
is a kind of worm
is a member of acanthocephala, phylum acanthocephala

annelid worm, army worm, beard worm, bladder worm, cabbage worm, dew worm, fishing worm, grugru worm, guinea worm, guinea worm disease, hair worm, measuring worm, nematode worm, oligochaete worm, palolo worm, parasitic worm, peanut worm, polychaete worm, polychete worm, potato worm, proboscis worm, railroad worm, red worm, ribbon worm, segmented worm, tomato worm, tongue worm, trematode worm, velvet worm, vinegar worm, 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