anhinga vs water turkey

anhinga and water turkey both are nouns.

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

As nouns, water turkey is a hyponym of anhinga; that is, water turkey is a word with a more specific, narrower meaning than anhinga:

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

Other hyponyms of anhinga include Anhinga anhinga.

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