yellowlegs vs sandpiper

yellowlegs and sandpiper both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellowlegs	Yes	No	No	No
sandpiper	Yes	No	No	No

As nouns, sandpiper is a hypernym of yellowlegs; that is, sandpiper is a word with a broader meaning than yellowlegs:

yellowlegs: either of two North American shorebird with yellow legs
sandpiper: any of numerous usually small wading birds having a slender bill and piping call; closely related to the plovers

yellowlegs (noun)	sandpiper (noun)
either of two North American shorebird with yellow legs	any of numerous usually small wading birds having a slender bill and piping call; closely related to the plovers