Na-adjective (keiyodoshi)fundamental; basic

Nounfeather; plume; down · wing · blade (of a fan, propeller, etc.)

Nounroot (of a plant) · root (of a tooth, hair, etc.); center (of a pimple, etc.) · root (of all evil, etc.); source; origin; cause; basis

Nounroof

Nounroot of an evil; source of a problem; source of trouble; cause of misfortune