topic vs area

topic and area both are nouns.

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

As nouns, area is a hyponym of topic; that is, area is a word with a more specific, narrower meaning than topic:

Other hyponyms of topic include blind spot, remit, res adjudicata, res judicata.

topic (noun)	area (noun)
some situation or event that is thought about	a part of a structure having some specific characteristic or function
the subject matter of a conversation or discussion	the extent of a 2-dimensional surface enclosed within a boundary
	a part of an animal that has a special function or is supplied by a given artery or nerve
	a subject of study
	a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography)
	a particular environment or walk of life