incense vs aroma

incense and aroma both are nouns.

Word	Noun	Adjective	Verb	Adverb
incense	Yes	No	Yes	No
aroma	Yes	No	No	No

As nouns, aroma is a hypernym of incense; that is, aroma is a word with a broader meaning than incense:

Other hypernyms of incense include fragrance, perfume, scent.

incense (noun)	aroma (noun)
the pleasing scent produced when incense is burned	any property detected by the olfactory system
a substance that produces a fragrant odor when burned	a distinctive odor that is pleasant

incense (verb)	aroma (verb)
make furious
perfume especially with a censer