seasnail vs limpet

seasnail and limpet both are nouns.

Word	Noun	Adjective	Verb	Adverb
seasnail	Yes	No	No	No
limpet	Yes	No	No	No

As nouns, limpet is a hyponym of seasnail; that is, limpet is a word with a more specific, narrower meaning than seasnail:

seasnail: any of several creeping marine gastropods with a spirally coiled shell: whelks, tritons, moon shells, neritids
limpet: any of various usually marine gastropods with low conical shells; found clinging to rocks in littoral areas

Other hyponyms of seasnail include neritid, neritid gastropod, whelk, triton, moon shell, moonshell, periwinkle, winkle.

seasnail (noun)	limpet (noun)
small tadpole-shaped cold-water fishes with pelvic fins forming a sucker; related to lumpfish	any of various usually marine gastropods with low conical shells; found clinging to rocks in littoral areas
any of several creeping marine gastropods with a spirally coiled shell: whelks, tritons, moon shells, neritids	mollusk with a low conical shell