Answer:
They each have a reading that repeats a sound.
注 CHUU, soso(gu) - note, comment, pour
幅 FUKU, haba - width, range
斜 SHA, nana(me) - slanting, diagonal, oblique
弟 DAI, TEI, otouto - younger brother
覆 FUKU, oo(u), kutsugae(ru), kutsugae(su) - cover, conceal, overturn