Republic of Chad vs Chad

Republic of Chad and Chad both are nouns.

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

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

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

Other synonyms of Republic of Chad include Tchad.

Republic of Chad (noun)	Chad (noun)
a landlocked desert republic in north-central Africa; was under French control until 1960	a family of Afroasiatic tonal languages (mostly two tones) spoken in the regions west and south of Lake Chad in north central Africa
	a landlocked desert republic in north-central Africa; was under French control until 1960
	a lake in north central Africa; fed by the Shari river