headline vs screamer

headline and screamer both are nouns.

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

As nouns, screamer is a hyponym of headline; that is, screamer is a word with a more specific, narrower meaning than headline:

Other hyponyms of headline include drop line, dropline, stagger head, staggered head, stephead, stepped line, banner, streamer.

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

headline (verb)	screamer (verb)
publicize widely or highly, as if with a headline
provide (a newspaper page or a story) with a headline