Tchad vs Republic of Chad

Tchad and Republic of Chad both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tchad	Yes	No	No	No
Republic of Chad	Yes	No	No	No

As nouns, Tchad and Republic of Chad are synonyms defined as:

Tchad and Republic of Chad: a landlocked desert republic in north-central Africa; was under French control until 1960

Other synonyms of Tchad include Chad.

Tchad (noun)	Republic of Chad (noun)
a landlocked desert republic in north-central Africa; was under French control until 1960	a landlocked desert republic in north-central Africa; was under French control until 1960