Yucatan vs Yucatan Peninsula

Yucatan and Yucatan Peninsula both are nouns.

Word	Noun	Adjective	Verb	Adverb
Yucatan	Yes	No	No	No
Yucatan Peninsula	Yes	No	No	No

As nouns, Yucatan and Yucatan Peninsula are synonyms defined as:

Yucatan and Yucatan Peninsula: a peninsula in Central America extending into the Gulf of Mexico between the Bay of Campeche and the Caribbean Sea

Yucatan (noun)	Yucatan Peninsula (noun)
a peninsula in Central America extending into the Gulf of Mexico between the Bay of Campeche and the Caribbean Sea	a peninsula in Central America extending into the Gulf of Mexico between the Bay of Campeche and the Caribbean Sea
a state of Mexico on the northern part of the Yucatan Peninsula