shore bird vs avocet

shore bird and avocet both are nouns.

Word	Noun	Adjective	Verb	Adverb
shore bird	Yes	No	No	No
avocet	Yes	No	No	No

As nouns, avocet is a hyponym of shore bird; that is, avocet is a word with a more specific, narrower meaning than shore bird:

shore bird: any of numerous wading birds that frequent mostly seashores and estuaries
avocet: long-legged web-footed black-and-white shorebird with slender upward-curving bill

shore bird (noun)	avocet (noun)
any of numerous wading birds that frequent mostly seashores and estuaries	long-legged web-footed black-and-white shorebird with slender upward-curving bill