pain vs pain sensation

pain and pain sensation both are nouns.

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

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

Other synonyms of pain include painful sensation.

pain (noun)	pain sensation (noun)
a somatic sensation of acute discomfort	a somatic sensation of acute discomfort
something or someone that causes trouble; a source of unhappiness
emotional distress; a fundamental feeling that people try to avoid
a symptom of some physical hurt or disorder

pain (verb)	pain sensation (verb)
cause bodily suffering to and make sick or indisposed
cause emotional anguish or make miserable