Finnish capital vs Helsingfors

Finnish capital and Helsingfors both are nouns.

Word	Noun	Adjective	Verb	Adverb
Finnish capital	Yes	No	No	No
Helsingfors	Yes	No	No	No

As nouns, Finnish capital and Helsingfors are synonyms defined as:

Finnish capital and Helsingfors: the capital and largest city of Finland; located in southern Finland; a major port and commercial and cultural center

Other synonyms of Finnish capital include capital of Finland, Helsinki.

Finnish capital (noun)	Helsingfors (noun)
the capital and largest city of Finland; located in southern Finland; a major port and commercial and cultural center	the capital and largest city of Finland; located in southern Finland; a major port and commercial and cultural center