vertical fin vs tail fin

vertical fin and tail fin both are nouns.

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

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

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

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

vertical fin (noun)	tail fin (noun)
a stabilizer that is part of the vertical tail structure of an airplane	the tail of fishes and some other aquatic vertebrates
	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