Colorado blue spruce vs Colorado spruce

Colorado blue spruce and Colorado spruce both are nouns.

Word	Noun	Adjective	Verb	Adverb
Colorado blue spruce	Yes	No	No	No
Colorado spruce	Yes	No	No	No

As nouns, Colorado blue spruce and Colorado spruce are synonyms defined as:

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

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

Colorado blue spruce (noun)	Colorado 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