Seville vs Sevilla

Seville and Sevilla both are nouns.

Word	Noun	Adjective	Verb	Adverb
Seville	Yes	No	No	No
Sevilla	Yes	No	No	No

As nouns, Seville and Sevilla are synonyms defined as:

Seville and Sevilla: a city in southwestern Spain; a major port and cultural center; the capital of bullfighting in Spain

Seville (noun)	Sevilla (noun)
a city in southwestern Spain; a major port and cultural center; the capital of bullfighting in Spain	a city in southwestern Spain; a major port and cultural center; the capital of bullfighting in Spain