火山灰[kazanbai] volcanic ash
灰になる[haininaru] to be reduced to ashes
灰の水曜日[hainosuiyoubi] Ash Wednesday
灰押さえ[haiosae] ash leveler (use in a brazier)
灰押し[haioshi] ash leveler (use in a brazier)

灰殻[haigara] ashes
灰均し[hainarashi] ash leveler
灰皿[haizara] ashtray
灰受け[haiuke] ash pan

上釉[uwagusuri] glaze
灰釉[haigusuri] ash glaze (type of fundamental glaze used in ancient times made from the ashes of raw materials such as unhulled rice, straw, oak and pine)
銅釉[douyuu] copper glaze (pottery)

無釉[muyuu] unglazed (e.g. pottery)
施釉[seyuu] glazing (ceramics)