topical vs topic

topical is not a noun while topic is a noun.

Word	Noun	Adjective	Verb	Adverb
topical	No	Yes	No	No
topic	Yes	No	No	No

topical (noun)	topic (noun)
	some situation or event that is thought about
	the subject matter of a conversation or discussion

topical (adjective)	topic (adjective)
of or relating to or arranged by topics
of interest at the present time
pertaining to the surface of a body part