tailfin vs vertical stabiliser

tailfin and vertical stabiliser both are nouns.

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

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

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

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

tailfin (noun)	vertical stabiliser (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