Bangkok vs capital of Thailand

Bangkok and capital of Thailand both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bangkok	Yes	No	No	No
capital of Thailand	Yes	No	No	No

As nouns, Bangkok and capital of Thailand are synonyms defined as:

Bangkok and capital of Thailand: the capital and largest city and chief port of Thailand; a leading city in southeastern Asia; noted for Buddhist architecture

Other synonyms of Bangkok include Krung Thep.

Bangkok (noun)	capital of Thailand (noun)
the capital and largest city and chief port of Thailand; a leading city in southeastern Asia; noted for Buddhist architecture	the capital and largest city and chief port of Thailand; a leading city in southeastern Asia; noted for Buddhist architecture