western hemlock vs Tsuga heterophylla

western hemlock and Tsuga heterophylla both are nouns.

Word	Noun	Adjective	Verb	Adverb
western hemlock	Yes	No	No	No
Tsuga heterophylla	Yes	No	No	No

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

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

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

western 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