赤い
あかい · akai · JLPT N5 · i-adj
red
🍎 akai = aka (red) + i, the adjective ending; aka also hides in akachan, baby
Etymology: aka shares a root with akarui (bright) and akeru (to dawn), so red was originally the bright colour. A newborn is an akachan because of its red face. Drop the i and aka is the noun red.