pine vs yearn

pine is a noun but yearn is not a noun.

Word	Noun	Adjective	Verb	Adverb
pine	Yes	No	Yes	No
yearn	No	No	Yes	No

As verbs, pine and yearn are synonyms defined as:

pine and yearn: have a desire for something or someone who is not present

Other synonyms of pine include ache, languish, yen.

As verbs, yearn is a hypernym of pine; that is, yearn is a word with a broader meaning than pine:

Other hypernyms of pine include hanker, long.

pine (noun)	yearn (noun)
a coniferous tree
straight-grained durable and often resinous white to yellowish timber of any of numerous trees of the genus Pinus

pine (verb)	yearn (verb)
have a desire for something or someone who is not present	desire strongly or persistently
	have a desire for something or someone who is not present
	have affection for; feel tenderness for