water turkey vs anhinga

water turkey and anhinga both are nouns.

Word	Noun	Adjective	Verb	Adverb
water turkey	Yes	No	No	No
anhinga	Yes	No	No	No

As nouns, anhinga is a hypernym of water turkey; that is, anhinga is a word with a broader meaning than water turkey:

water turkey: blackish New World snakebird of swampy regions
anhinga: fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill

Other hypernyms of water turkey include darter, snakebird.

water turkey (noun)	anhinga (noun)
blackish New World snakebird of swampy regions	fish-eating bird of warm inland waters having a long flexible neck and slender sharp-pointed bill