Kolkata vs Calcutta

Kolkata and Calcutta both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kolkata	Yes	No	No	No
Calcutta	Yes	No	No	No

As nouns, Kolkata and Calcutta are synonyms defined as:

Kolkata and Calcutta: the largest city in India and one of the largest cities in the world; located in eastern India; suffers from poverty and overcrowding

Kolkata (noun)	Calcutta (noun)
the largest city in India and one of the largest cities in the world; located in eastern India; suffers from poverty and overcrowding	the largest city in India and one of the largest cities in the world; located in eastern India; suffers from poverty and overcrowding