valley oak vs California white oak

valley oak and California white oak both are nouns.

Word	Noun	Adjective	Verb	Adverb
valley oak	Yes	No	No	No
California white oak	Yes	No	No	No

As nouns, valley oak and California white oak are synonyms defined as:

valley oak and California white oak: tall graceful deciduous California oak having leathery leaves and slender pointed acorns

Other synonyms of valley oak include Quercus lobata, roble, valley white oak.

valley oak (noun)	California white oak (noun)
tall graceful deciduous California oak having leathery leaves and slender pointed acorns	tall graceful deciduous California oak having leathery leaves and slender pointed acorns