line drawing vs depiction

line drawing and depiction both are nouns.

Word	Noun	Adjective	Verb	Adverb
line drawing	Yes	No	No	No
depiction	Yes	No	No	No

As nouns, line drawing and depiction are synonyms defined as:

line drawing and depiction: a drawing of the outlines of forms or objects

Other synonyms of line drawing include delineation, limning.

line drawing (noun)	depiction (noun)
a drawing of the outlines of forms or objects	representation by drawing or painting etc
	a drawing of the outlines of forms or objects
	a representation by picture or portraiture
	a graphic or vivid verbal description