dropline vs drop line

dropline and drop line both are nouns.

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

As nouns, dropline and drop line are synonyms defined as:

dropline and drop line: a headline with the top line flush left and succeeding lines indented to the right

Other synonyms of dropline include stagger head, staggered head, stephead, stepped line.

dropline (noun)	drop line (noun)
a headline with the top line flush left and succeeding lines indented to the right	a headline with the top line flush left and succeeding lines indented to the right