tell vs mention

tell is not a noun while mention is a noun.

Word	Noun	Adjective	Verb	Adverb
tell	No	No	Yes	No
mention	Yes	No	Yes	No

As verbs, mention is a hyponym of tell; that is, mention is a word with a more specific, narrower meaning than tell:

tell (noun)	mention (noun)
	an official recognition of merit
	a remark that calls attention to something or someone
	a short note recognizing a source of information or of a quoted passage

tell (verb)	mention (verb)
discern or comprehend	make mention of
mark as different	commend
let something be known	make reference to
narrate or give a detailed account of
give instructions to or direct somebody to do something with authority
give evidence
express in words
inform positively and with certainty and confidence