scaphopod vs mollusc

scaphopod and mollusc both are nouns.

Word	Noun	Adjective	Verb	Adverb
scaphopod	Yes	No	No	No
mollusc	Yes	No	No	No

As nouns, mollusc is a hypernym of scaphopod; that is, mollusc is a word with a broader meaning than scaphopod:

scaphopod: burrowing marine mollusk
mollusc: invertebrate having a soft unsegmented body usually enclosed in a shell

Other hypernyms of scaphopod include mollusk, shellfish.

scaphopod (noun)	mollusc (noun)
burrowing marine mollusk	invertebrate having a soft unsegmented body usually enclosed in a shell