screamer vs waterfowl

screamer and waterfowl both are nouns.

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

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

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

Other hypernyms of screamer include water bird, waterbird.

screamer (noun)	waterfowl (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