curlew vs shorebird

curlew and shorebird both are nouns.

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

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

curlew: large migratory shorebirds of the sandpiper family; closely related to woodcocks but having a down-curved bill
shorebird: any of numerous wading birds that frequent mostly seashores and estuaries

Other hypernyms of curlew include limicoline bird, shore bird.

curlew (noun)	shorebird (noun)
large migratory shorebirds of the sandpiper family; closely related to woodcocks but having a down-curved bill	any of numerous wading birds that frequent mostly seashores and estuaries