screamer vs waterbird

screamer and waterbird both are nouns.

Word	Noun	Adjective	Verb	Adverb
screamer	Yes	No	No	No
waterbird	Yes	No	No	No

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

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

Other hypernyms of screamer include water bird, waterfowl.

screamer (noun)	waterbird (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