heterocercal fin vs homocercal fin

heterocercal fin and homocercal fin both are nouns.

Word	Noun	Adjective	Verb	Adverb
heterocercal fin	Yes	No	No	No
homocercal fin	Yes	No	No	No

heterocercal fin (noun)	homocercal fin (noun)
a tail fin with unequal lobes in which the vertebral column turns upward into the larger lobe as in sharks	symmetrical tail fin extending beyond the end of the vertebral column as in most bony fishes