odor vs acridity

odor and acridity both are nouns.

Word	Noun	Adjective	Verb	Adverb
odor	Yes	No	No	No
acridity	Yes	No	No	No

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

odor: the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form
acridity: having an acrid smell

Other hyponyms of odor include scent, aroma, fragrance, perfume, scent, fetor, foetor, malodor, malodour, mephitis, reek, stench, stink, stank.

odor (noun)	acridity (noun)
any property detected by the olfactory system	extreme bitterness
the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form	the quality of being sharply disagreeable in language or tone
	having an acrid smell