Tsuga heterophylla vs western hemlock

Tsuga heterophylla and western hemlock both are nouns.

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

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

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

Other synonyms of Tsuga heterophylla include Pacific hemlock, west coast hemlock.

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