sense impression vs sensation

sense impression and sensation both are nouns.

Word	Noun	Adjective	Verb	Adverb
sense impression	Yes	No	No	No
sensation	Yes	No	No	No

As nouns, sense impression and sensation are synonyms defined as:

sense impression and sensation: an unelaborated elementary awareness of stimulation

Other synonyms of sense impression include aesthesis, esthesis, sense datum, sense experience.

sense impression (noun)	sensation (noun)
an unelaborated elementary awareness of stimulation	an unelaborated elementary awareness of stimulation
	the faculty through which the external world is apprehended
	a general feeling of excitement and heightened interest
	someone who is dazzlingly skilled in any field
	a state of widespread public excitement and interest