Ceylon vs Sri Lanka

Ceylon and Sri Lanka both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ceylon	Yes	No	No	No
Sri Lanka	Yes	No	No	No

As nouns, Ceylon and Sri Lanka are synonyms defined as:

Ceylon and Sri Lanka: an island in the Indian Ocean off the southeastern coast of India

As nouns, Ceylon and Sri Lanka are synonyms defined as:

Ceylon and Sri Lanka: a republic on the island of Ceylon; became independent of the United Kingdom in 1948

Other synonyms of Ceylon include Democratic Socialist Republic of Sri Lanka.

Ceylon (noun)	Sri Lanka (noun)
an island in the Indian Ocean off the southeastern coast of India	a republic on the island of Ceylon; became independent of the United Kingdom in 1948
a republic on the island of Ceylon; became independent of the United Kingdom in 1948	an island in the Indian Ocean off the southeastern coast of India