kōng = ku + (e)ng1
empty / air / sky / in vain
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kòng = ku + (e)ng4
to empty / vacant / unoccupied / space / leisure / free time
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空 character breakdown

gōng = gu + (e)ng1
work / worker / skill / profession / trade / craft / labor
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xué = xu + e2
cave / cavity / hole / acupuncture point / Taiwan pr. [xue4]
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