bank note vs clam

bank note and clam both are nouns.

Word	Noun	Adjective	Verb	Adverb
bank note	Yes	No	No	No
clam	Yes	No	Yes	No

As nouns, clam is a hyponym of bank note; that is, clam is a word with a more specific, narrower meaning than bank note:

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

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