painful sensation vs pain sensation

painful sensation and pain sensation both are nouns.

Word	Noun	Adjective	Verb	Adverb
painful sensation	Yes	No	No	No
pain sensation	Yes	No	No	No

As nouns, painful sensation and pain sensation are synonyms defined as:

painful sensation and pain sensation: a somatic sensation of acute discomfort

Other synonyms of painful sensation include pain.

painful sensation (noun)	pain sensation (noun)
a somatic sensation of acute discomfort	a somatic sensation of acute discomfort