olfactory sensation vs esthesis

olfactory sensation and esthesis both are nouns.

Word	Noun	Adjective	Verb	Adverb
olfactory sensation	Yes	No	No	No
esthesis	Yes	No	No	No

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

olfactory sensation: 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 olfactory sensation include aesthesis, sensation, sense datum, sense experience, sense impression.

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