sǔn
mortise and tenon (slot and tab forming a carpenter's joint)
sǔn tou
tenon (wooden projection to fit into a mortise)
sǔn yǎn
mortise (slot cut into wood to receive a tenon)
mǎo sǔn
mortise and tenon (slot and tab forming a carpenter's joint)
kǎ sǔn
clip
latch (on a clip-into-place component)