Baja California Peninsula vs Baja California

Baja California Peninsula and Baja California both are nouns.

Word	Noun	Adjective	Verb	Adverb
Baja California Peninsula	Yes	No	No	No
Baja California	Yes	No	No	No

As nouns, Baja California Peninsula and Baja California are synonyms defined as:

Baja California Peninsula and Baja California: a mountainous peninsula on northwest Mexico

Other synonyms of Baja California Peninsula include Lower California.

Baja California Peninsula (noun)	Baja California (noun)
a mountainous peninsula on northwest Mexico	a mountainous peninsula on northwest Mexico