spice tree vs California olive

spice tree and California olive both are nouns.

Word	Noun	Adjective	Verb	Adverb
spice tree	Yes	No	No	No
California olive	Yes	No	No	No

As nouns, spice tree and California olive are synonyms defined as:

spice tree and California olive: Pacific coast tree having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood

spice tree (noun)	California olive (noun)
tree bearing aromatic bark or berries	Pacific coast tree having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood
Pacific coast tree having aromatic foliage and small umbellate flowers followed by olivelike fruit; yields a hard tough wood