Answer:
They each have a reading that repeats a sound.
大 DAI, oo(kii) - big
志 SHI, kokorozashi - intent, will
滞 TAI, todokou(ru) - be left undone, stay, stopover
恭 KYOU, uyauya(shii) - respectful, reverent
覆 FUKU, oo(u), kutsugae(ru), kutsugae(su) - cover, conceal, overturn