topic vs theme

topic and theme both are nouns.

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

As nouns, topic and theme are synonyms defined as:

Other synonyms of topic include subject.

topic (noun)	theme (noun)
some situation or event that is thought about	a unifying idea that is a recurrent element in literary or artistic work
the subject matter of a conversation or discussion	the subject matter of a conversation or discussion
	an essay (especially one written as an assignment)
	(music) melodic subject of a musical composition
	(linguistics) the form of a word after all affixes are removed

topic (verb)	theme (verb)
	provide with a particular theme or motive