greenshank vs sandpiper

greenshank and sandpiper both are nouns.

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

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

greenshank: large European sandpiper with greenish legs
sandpiper: any of numerous usually small wading birds having a slender bill and piping call; closely related to the plovers

greenshank (noun)	sandpiper (noun)
large European sandpiper with greenish legs	any of numerous usually small wading birds having a slender bill and piping call; closely related to the plovers