yellow spruce vs eastern spruce

yellow spruce and eastern spruce both are nouns.

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

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

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

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

yellow spruce (noun)	eastern 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