west coast hemlock vs Pacific hemlock

west coast hemlock and Pacific hemlock both are nouns.

Word	Noun	Adjective	Verb	Adverb
west coast hemlock	Yes	No	No	No
Pacific hemlock	Yes	No	No	No

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

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

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

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