Tangier vs Tangiers

Tangier and Tangiers both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tangier	Yes	No	No	No
Tangiers	Yes	No	No	No

As nouns, Tangier and Tangiers are synonyms defined as:

Tangier and Tangiers: a city of northern Morocco at the west end of the Strait of Gibraltar

Tangier (noun)	Tangiers (noun)
a city of northern Morocco at the west end of the Strait of Gibraltar	a city of northern Morocco at the west end of the Strait of Gibraltar