teredo vs shipworm

teredo and shipworm both are nouns.

Word	Noun	Adjective	Verb	Adverb
teredo	Yes	No	No	No
shipworm	Yes	No	No	No

As nouns, shipworm is a hypernym of teredo; that is, shipworm is a word with a broader meaning than teredo:

teredo: typical shipworm
shipworm: wormlike marine bivalve that bores into wooden piers and ships by means of drill-like shells

Other hypernyms of teredo include teredinid.

teredo (noun)	shipworm (noun)
typical shipworm	wormlike marine bivalve that bores into wooden piers and ships by means of drill-like shells