榫⇒ 榫眼 sǔnyǎn, mortise (slot cut into wood to receive a tenon)
凿⇒ 确凿 quèzáo, [確鑿], definite/conclusive/undeniable/authentic/also pr. [què zuò] 凿 záo, [鑿], chisel/to bore a hole/to chisel or dig/certain/authentic/irrefutable/also pr. [z... 凿子 záozǐ, [鑿子], chisel 开凿 kāizáo, [開鑿], to cut (a canal, tunnel, well etc)