Colorado spruce vs Colorado blue spruce

Colorado spruce and Colorado blue spruce both are nouns.

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

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

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

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

Colorado spruce (noun)	Colorado blue 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