red spruce vs eastern spruce

red spruce and eastern spruce both are nouns.

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

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

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

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

red 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