空腔

空腔	kōng qiāng	cavity
空	kōng	empty / air / sky / in vain
空	kòng	to empty / vacant / unoccupied / space / leisure / free time
腔	qiāng	(bound form) cavity / (bound form) speech; talk / tune / accent (in one's speech) / (old) classifier for carcasses of slaughtered livestock