west coast hemlock vs Tsuga heterophylla

west coast hemlock and Tsuga heterophylla both are nouns.

Word	Noun	Adjective	Verb	Adverb
west coast hemlock	Yes	No	No	No
Tsuga heterophylla	Yes	No	No	No

As nouns, west coast hemlock and Tsuga heterophylla are synonyms defined as:

west coast hemlock and Tsuga heterophylla: tall evergreen of western North America; commercially important timber tree

Other synonyms of west coast hemlock include Pacific hemlock, western hemlock.

west coast hemlock (noun)	Tsuga heterophylla (noun)
tall evergreen of western North America; commercially important timber tree	tall evergreen of western North America; commercially important timber tree