western yew vs California yew

western yew and California yew both are nouns.

Word	Noun	Adjective	Verb	Adverb
western yew	Yes	No	No	No
California yew	Yes	No	No	No

As nouns, western yew and California yew are synonyms defined as:

western yew and California yew: small or medium irregularly branched tree of the Pacific coast of North America; yields fine hard close-grained wood

Other synonyms of western yew include Pacific yew, Taxus brevifolia.

western yew (noun)	California yew (noun)
small or medium irregularly branched tree of the Pacific coast of North America; yields fine hard close-grained wood	small or medium irregularly branched tree of the Pacific coast of North America; yields fine hard close-grained wood