Ho Chi Minh City vs Saigon

Ho Chi Minh City and Saigon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ho Chi Minh City	Yes	No	No	No
Saigon	Yes	No	No	No

As nouns, Ho Chi Minh City and Saigon are synonyms defined as:

Ho Chi Minh City and Saigon: a city in South Vietnam; formerly (as Saigon) it was the capital of French Indochina

Ho Chi Minh City (noun)	Saigon (noun)
a city in South Vietnam; formerly (as Saigon) it was the capital of French Indochina	a city in South Vietnam; formerly (as Saigon) it was the capital of French Indochina