Gautama vs Buddha

Gautama and Buddha both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gautama	Yes	No	No	No
Buddha	Yes	No	No	No

As nouns, Gautama and Buddha are synonyms defined as:

Other synonyms of Gautama include Gautama Buddha, Gautama Siddhartha, Siddhartha.

Gautama (noun)	Buddha (noun)
founder of Buddhism (c 563-483 BC)	founder of Buddhism (c 563-483 BC)
	one who has achieved a state of perfect enlightenment