Pacific hemlock vs west coast hemlock

Pacific hemlock and west coast hemlock both are nouns.

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

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

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

Other synonyms of Pacific hemlock include Tsuga heterophylla, western hemlock.

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