tail fin vs vertical fin

tail fin and vertical fin both are nouns.

Word	Noun	Adjective	Verb	Adverb
tail fin	Yes	No	No	No
vertical fin	Yes	No	No	No

As nouns, tail fin and vertical fin are synonyms defined as:

tail fin and vertical fin: a stabilizer that is part of the vertical tail structure of an airplane

Other synonyms of tail fin include tailfin, vertical stabiliser, vertical stabilizer.

tail fin (noun)	vertical fin (noun)
the tail of fishes and some other aquatic vertebrates	a stabilizer that is part of the vertical tail structure of an airplane
a stabilizer that is part of the vertical tail structure of an airplane
one of a pair of decorations projecting above the rear fenders of an automobile