Answer:
a) 妄 -> 妙 -> 省 -> 眺
妄 MOU, BOU - without reason, without authority
妙 MYOU - strange, odd, adroit, mystery
省 SEI, SHOU, kaerimiru, habu(ku) - ministry, reflect, omit
眺 CHOU, naga(meru) - look at, watch, gaze
b) 誓 -> 訟 -> 翁 -> 翼
誓 SEI, chika(u) - swear, pledge, vow
訟 SHOU - accuse
翁 OU - old man
翼 YOKU, tsubasa - wing