instructions vs manual

instructions and manual both are nouns.

Word	Noun	Adjective	Verb	Adverb
instructions	Yes	No	No	No
manual	Yes	Yes	No	No

As nouns, manual is a hypernym of instructions; that is, manual is a word with a broader meaning than instructions:

instructions: a manual usually accompanying a technical device and explaining how to install or operate it
manual: a small handbook

instructions (noun)	manual (noun)
a manual usually accompanying a technical device and explaining how to install or operate it	(military) a prescribed drill in handling a rifle
	a small handbook

instructions (adjective)	manual (adjective)
	requiring human effort
	of or relating to the hands
	doing or requiring physical work