headline vs drop line

headline and drop line both are nouns.

Word	Noun	Adjective	Verb	Adverb
headline	Yes	No	Yes	No
drop line	Yes	No	No	No

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

headline: the heading or caption of a newspaper article
drop line: a headline with the top line flush left and succeeding lines indented to the right

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

headline (noun)	drop line (noun)
the heading or caption of a newspaper article	a headline with the top line flush left and succeeding lines indented to the right

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