vertical stabilizer vs tailfin

vertical stabilizer and tailfin both are nouns.

Word	Noun	Adjective	Verb	Adverb
vertical stabilizer	Yes	No	No	No
tailfin	Yes	No	No	No

As nouns, vertical stabilizer and tailfin are synonyms defined as:

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

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

vertical stabilizer (noun)	tailfin (noun)
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