fish vs caudal fin

fish and caudal fin both are nouns.

Word	Noun	Adjective	Verb	Adverb
fish	Yes	No	Yes	No
caudal fin	Yes	No	No	No

fish (noun)	caudal fin (noun)
any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills	the tail of fishes and some other aquatic vertebrates
the flesh of fish used as food

fish (verb)	caudal fin (verb)
catch or try to catch fish or shellfish
seek indirectly