Component (a building block) — not the same thing as a radical or a sound component. · 3strokes
中串兄免兑加占古
Kangxi radical no.30 · 3strokes — The 214 Kangxi radicals
Filed under it in a dictionary. That is a lookup convention — it does not mean it is the only part the character is built from.
口古句另叨叩只叫