Indochina vs Indochinese peninsula

Indochina and Indochinese peninsula both are nouns.

Word	Noun	Adjective	Verb	Adverb
Indochina	Yes	No	No	No
Indochinese peninsula	Yes	No	No	No

As nouns, Indochina and Indochinese peninsula are synonyms defined as:

Indochina and Indochinese peninsula: a peninsula of southeastern Asia that includes Myanmar and Cambodia and Laos and Malaysia and Thailand and Vietnam

Indochina (noun)	Indochinese peninsula (noun)
a peninsula of southeastern Asia that includes Myanmar and Cambodia and Laos and Malaysia and Thailand and Vietnam	a peninsula of southeastern Asia that includes Myanmar and Cambodia and Laos and Malaysia and Thailand and Vietnam