Republic of Chad vs Tchad

Republic of Chad and Tchad both are nouns.

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

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

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

Other synonyms of Republic of Chad include Chad.

Republic of Chad (noun)	Tchad (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