homocercal fin vs heterocercal fin

homocercal fin and heterocercal fin both are nouns.

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

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