yearn vs pine

yearn is not a noun while pine is a noun.

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

As verbs, pine is a hyponym of yearn; that is, pine is a word with a more specific, narrower meaning than yearn:

Other hyponyms of yearn include ache, languish, yearn, yen.

As verbs, yearn and pine are synonyms defined as:

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

Other synonyms of yearn include ache, languish, yen.

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

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