odour vs esthesis

odour and esthesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
odour	Yes	No	No	No
esthesis	Yes	No	No	No

As nouns, esthesis is a hypernym of odour; that is, esthesis is a word with a broader meaning than odour:

odour: the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form
esthesis: an unelaborated elementary awareness of stimulation

Other hypernyms of odour include aesthesis, sensation, sense datum, sense experience, sense impression.

odour (noun)	esthesis (noun)
any property detected by the olfactory system	an unelaborated elementary awareness of stimulation
the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form