Component (a building block) — not the same thing as a radical or a sound component. · 3strokes
仔好孔孕字存孙孝
Kangxi radical no.39 · 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.
子孔孕字存孙孝孟