shorebird vs stiltbird

shorebird and stiltbird both are nouns.

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

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

shorebird: any of numerous wading birds that frequent mostly seashores and estuaries
stiltbird: long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons

shorebird (noun)	stiltbird (noun)
any of numerous wading birds that frequent mostly seashores and estuaries	long-legged three-toed black-and-white wading bird of inland ponds and marshes or brackish lagoons