yellow bells vs California yellow bells

yellow bells and California yellow bells both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow bells	Yes	No	No	No
California yellow bells	Yes	No	No	No

As nouns, yellow bells and California yellow bells are synonyms defined as:

yellow bells and California yellow bells: viscid herb of arid or desert habitats of southwestern United States having pendulous yellow flowers

Other synonyms of yellow bells include Emmanthe penduliflora, whispering bells.

yellow bells (noun)	California yellow bells (noun)
viscid herb of arid or desert habitats of southwestern United States having pendulous yellow flowers	viscid herb of arid or desert habitats of southwestern United States having pendulous yellow flowers