座垫

座垫	zuò diàn	saddle (of a bicycle); seat (of a car or bike) / chair cushion
座	zuò	seat / base; stand / (bound form) constellation / (archaic) suffix used in a respectful form of address (e.g. 师座) / classifier for large immovable objects such as buildings, mountains, bridges etc
垫	diàn	pad / cushion / mat / to pad out / to fill a gap / to pay for sb / to advance (money)