clam vs banknote

clam and banknote both are nouns.

Word	Noun	Adjective	Verb	Adverb
clam	Yes	No	Yes	No
banknote	Yes	No	No	No

As nouns, banknote is a hypernym of clam; that is, banknote is a word with a broader meaning than clam:

clam (noun)	banknote (noun)
burrowing marine mollusk living on sand or mud; the shell closes with viselike firmness	a piece of paper money (especially one issued by a central bank)
flesh of either hard-shell or soft-shell clams
a piece of paper money worth one dollar

clam (verb)	banknote (verb)
gather clams, by digging in the sand by the ocean