bustard vs wader

bustard and wader both are nouns.

Word	Noun	Adjective	Verb	Adverb
bustard	Yes	No	No	No
wader	Yes	No	No	No

As nouns, wader is a hypernym of bustard; that is, wader is a word with a broader meaning than bustard:

bustard: large heavy-bodied chiefly terrestrial game bird capable of powerful swift flight; classified with wading birds but frequents grassy steppes
wader: any of many long-legged birds that wade in water in search of food

Other hypernyms of bustard include wading bird.

bustard (noun)	wader (noun)
large heavy-bodied chiefly terrestrial game bird capable of powerful swift flight; classified with wading birds but frequents grassy steppes	any of many long-legged birds that wade in water in search of food