threadfin: mullet-like tropical marine fishes having pectoral fins with long threadlike rays
percoid fish: any of numerous spiny-finned fishes of the order Perciformes
niger-kordofanian: the family of languages that includes most of the languages spoken in Africa south of the Sahara; the majority of them are tonal languages but there are important exceptions (e.g., Swahili or Fula)