talk vs instruct

talk is a noun but instruct is not a noun.

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

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

Other hypernyms of talk include learn, teach.

talk (noun)	instruct (noun)
the act of giving a talk to an audience
an exchange of ideas via conversation
idle gossip or rumor
a speech that is open to the public
discussion; (`talk about' is a less formal alternative for `discussion of')

talk (verb)	instruct (verb)
express in speech	impart skills or knowledge to
exchange thoughts; talk with	give instructions or directions for some task
reveal information	make aware of
use language
deliver a lecture or talk
divulge confidential information or secrets