leging vs gaiter

leging and gaiter both are nouns.

Word	Noun	Adjective	Verb	Adverb
leging	Yes	No	No	No
gaiter	Yes	No	No	No

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

leging: a garment covering the leg (usually extending from the knee to the ankle)
gaiter: legging consisting of a cloth or leather covering for the leg from the knee to the ankle

Other hyponyms of leging include chap, puttee, spat.

leging (noun)	gaiter (noun)
a garment covering the leg (usually extending from the knee to the ankle)	legging consisting of a cloth or leather covering for the leg from the knee to the ankle
	a cloth covering (a legging) that covers the instep and ankles
	a shoe covering the ankle with elastic gores in the sides