waders vs thigh boot

waders and thigh boot both are nouns.

Word	Noun	Adjective	Verb	Adverb
waders	Yes	No	No	No
thigh boot	Yes	No	No	No

As nouns, thigh boot is a hypernym of waders; that is, thigh boot is a word with a broader meaning than waders:

waders: waterproof hip boots (sometimes extending to the chest) worn by anglers
thigh boot: a very high boot; used especially for fishing

Other hypernyms of waders include hip boot.

waders (noun)	thigh boot (noun)
waterproof hip boots (sometimes extending to the chest) worn by anglers	a very high boot; used especially for fishing