The word "Chadic" refers to a language family spoken in West Africa. Some synonyms for "Chadic" could include words like "Afroasiatic", "Semitic", or "Nilo-Saharan", as these represent other language families and regions also spoken in Africa. Alternatively, one could use "Gur" or "Mande", which are two language families that are often studied alongside Chadic due to their proximity and shared historical influences. Whatever word is chosen, it will likely be used in the context of linguistic or cultural studies and may be accompanied by other specialized terminology.