rough drawing vs sketch

rough drawing and sketch both are nouns.

Word	Noun	Adjective	Verb	Adverb
rough drawing	Yes	No	No	No
sketch	Yes	No	Yes	No

As nouns, sketch is a hypernym of rough drawing; that is, sketch is a word with a broader meaning than rough drawing:

Other hypernyms of rough drawing include study.

rough drawing (noun)	sketch (noun)
a preliminary sketch of a design or picture	preliminary drawing for later elaboration
	short descriptive summary (of events)
	a humorous or satirical drawing published in a newspaper or magazine
	a brief literary description

rough drawing (verb)	sketch (verb)
	describe roughly or briefly or give the main points or summary of
	make a sketch of