killdeer vs plover

killdeer and plover both are nouns.

Word	Noun	Adjective	Verb	Adverb
killdeer	Yes	No	No	No
plover	Yes	No	No	No

As nouns, plover is a hypernym of killdeer; that is, plover is a word with a broader meaning than killdeer:

killdeer: American plover of inland waters and fields having a distinctive cry
plover: any of numerous chiefly shorebirds of relatively compact build having straight bills and large pointed wings; closely related to the sandpipers

killdeer (noun)	plover (noun)
American plover of inland waters and fields having a distinctive cry	any of numerous chiefly shorebirds of relatively compact build having straight bills and large pointed wings; closely related to the sandpipers