silver pine vs western white pine

silver pine and western white pine both are nouns.

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

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

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

Other synonyms of silver pine include mountain pine, Pinus monticola.

silver pine (noun)	western white 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