Picea pungens vs silver spruce

Picea pungens and silver spruce both are nouns.

Word	Noun	Adjective	Verb	Adverb
Picea pungens	Yes	No	No	No
silver spruce	Yes	No	No	No

As nouns, Picea pungens and silver spruce are synonyms defined as:

Picea pungens and silver spruce: tall spruce with blue-green needles and dense conic crown; older trees become columnar with lower branches sweeping downward

Other synonyms of Picea pungens include Colorado blue spruce, Colorado spruce.

Picea pungens (noun)	silver spruce (noun)
tall spruce with blue-green needles and dense conic crown; older trees become columnar with lower branches sweeping downward	tall spruce with blue-green needles and dense conic crown; older trees become columnar with lower branches sweeping downward