topical vs current

topical is not a noun while current is a noun.

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

topical (noun)	current (noun)
	a steady flow of a fluid (usually from natural causes)
	dominant course (suggestive of running water) of successive events or ideas
	a flow of electricity through a conductor

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