talk vs run on

talk is a noun but run on is not a noun.

Word	Noun	Adjective	Verb	Adverb
talk	Yes	No	Yes	No
run on	No	No	Yes	No

As verbs, run on is a hyponym of talk; that is, run on is a word with a more specific, narrower meaning than talk:

Other hyponyms of talk include smatter, slang.

talk (noun)	run on (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)	run on (verb)
express in speech	talk or narrate at length
exchange thoughts; talk with	continue uninterrupted
reveal information
use language
deliver a lecture or talk
divulge confidential information or secrets