red spruce vs yellow spruce

red spruce and yellow spruce both are nouns.

Word	Noun	Adjective	Verb	Adverb
red spruce	Yes	No	No	No
yellow spruce	Yes	No	No	No

As nouns, red spruce and yellow spruce are synonyms defined as:

red spruce and yellow spruce: medium-sized spruce of eastern North America; chief lumber spruce of the area; source of pulpwood

Other synonyms of red spruce include eastern spruce, Picea rubens.

red spruce (noun)	yellow spruce (noun)
medium-sized spruce of eastern North America; chief lumber spruce of the area; source of pulpwood	medium-sized spruce of eastern North America; chief lumber spruce of the area; source of pulpwood