thorn vs pain

thorn and pain both are nouns.

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

As nouns, pain is a hypernym of thorn; that is, pain is a word with a broader meaning than thorn:

thorn (noun)	pain (noun)
something that causes irritation and annoyance	a somatic sensation of acute discomfort
a Germanic character of runic origin	something or someone that causes trouble; a source of unhappiness
a small sharp-pointed tip resembling a spike on a stem or leaf	emotional distress; a fundamental feeling that people try to avoid
	a symptom of some physical hurt or disorder

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