shorebird vs wader

shorebird and wader both are nouns.

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

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

shorebird: any of numerous wading birds that frequent mostly seashores and estuaries
wader: any of many long-legged birds that wade in water in search of food

Other hypernyms of shorebird include wading bird.

shorebird (noun)	wader (noun)
any of numerous wading birds that frequent mostly seashores and estuaries	any of many long-legged birds that wade in water in search of food