Lake Chad vs Chad

Lake Chad and Chad both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lake Chad	Yes	No	No	No
Chad	Yes	No	No	No

As nouns, Lake Chad and Chad are synonyms defined as:

Lake Chad and Chad: a lake in north central Africa; fed by the Shari river

Lake Chad (noun)	Chad (noun)
a lake in north central Africa; fed by the Shari river	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