screamer vs water bird

screamer and water bird both are nouns.

Word	Noun	Adjective	Verb	Adverb
screamer	Yes	No	No	No
water bird	Yes	No	No	No

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

screamer: gooselike aquatic bird of South America having a harsh trumpeting call
water bird: freshwater aquatic bird

Other hypernyms of screamer include waterbird, waterfowl.

screamer (noun)	water bird (noun)
a very hard hit ball	freshwater aquatic bird
gooselike aquatic bird of South America having a harsh trumpeting call
a sensational newspaper headline
someone who communicates vocally in a very loud voice