凹是多音字，其同音字分別是：

凹 āo,wā

熬 āo,áo

爊 āo

泑 yōu,yòu,āo

熝 lù,āo

柪 āo,ào

梎 āo,yòu

軪 āo,ào

眑 yǎo,āo,ǎo

凹 āo,wā

窪 wā

咼 wāi,hé,wǒ,wā,guǎ,guō

媧 wā

蛙 wā

哇 wā,wa

挖 wā

窊 wā

屲 wā

窪 wā

鼃 wā

搲 wā,wǎ,wà

唲 ér,wā

韈 wā

徍 wàng,jiā,wā

穵 wā

漥 wā

窐 wā,guī

啘 yuē,wā

攨 wā

嗗 wā,gǔ

劸 wā

溛 wā

畖 wā

瓾 wā