western white pine vs silver pine

western white pine and silver pine both are nouns.

Word	Noun	Adjective	Verb	Adverb
western white pine	Yes	No	No	No
silver pine	Yes	No	No	No

As nouns, western white pine and silver pine are synonyms defined as:

western white pine and silver pine: tall pine of western North America with stout blue-green needles; bark is grey-brown with rectangular plates when mature

Other synonyms of western white pine include mountain pine, Pinus monticola.

western white pine (noun)	silver pine (noun)
tall pine of western North America with stout blue-green needles; bark is grey-brown with rectangular plates when mature	tall pine of western North America with stout blue-green needles; bark is grey-brown with rectangular plates when mature
	timber tree of New Zealand having shiny white wood