stabiliser vs fin

stabiliser and fin both are nouns.

Word	Noun	Adjective	Verb	Adverb
stabiliser	Yes	No	No	No
fin	Yes	No	Yes	No

As nouns, fin is a hyponym of stabiliser; that is, fin is a word with a more specific, narrower meaning than stabiliser:

Other hyponyms of stabiliser include gyrostabiliser, gyrostabilizer, outrigger, anti-sway bar, stabilizer bar.

stabiliser (noun)	fin (noun)
a device for making something stable	organ of locomotion and balance in fishes and some other aquatic animals
	a stabilizer on a ship that resembles the fin of a fish
	one of a set of parallel slats in a door or window to admit air and reject rain
	a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater)
	one of a pair of decorations projecting above the rear fenders of an automobile
	the cardinal number that is the sum of four and one

stabiliser (verb)	fin (verb)
	show the fins above the water while swimming
	propel oneself through the water in a finning motion
	equip (a car) with fins