instruct vs say

instruct is not a noun while say is a noun.

Word	Noun	Adjective	Verb	Adverb
instruct	No	No	Yes	No
say	Yes	No	Yes	No

As verbs, say is a hypernym of instruct; that is, say is a word with a broader meaning than instruct:

Other hypernyms of instruct include enjoin, order, tell.

instruct (noun)	say (noun)
	the chance to speak

instruct (verb)	say (verb)
impart skills or knowledge to	express in words
give instructions or directions for some task	report or maintain
make aware of	speak, pronounce, or utter in a certain way
	express a supposition
	give instructions to or direct somebody to do something with authority
	communicate or express nonverbally
	recite or repeat a fixed text
	indicate
	state as one's opinion or judgement; declare
	utter aloud
	have or contain a certain wording or form