pine tree vs pine

pine tree and pine both are nouns.

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

As nouns, pine tree and pine are synonyms defined as:

Other synonyms of pine tree include true pine.

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

pine tree (verb)	pine (verb)
	have a desire for something or someone who is not present