Chinese words with 空 character meaning (HSK)

KONG1, TIAO2
air conditioning

KONG1
to empty, vacant, unoccupied, space, leisure, free time

KONG1, QI4
air, atmosphere

TIAN2, KONG4
to fill a job vacancy, to fill in a blank (e.g. on questionnaire or exam paper)

KONG1, JIAN1
space (astronomy)

KONG4, XIAN2
idle, free time, leisure

HANG2, KONG1
aviation

KONG1, DONG4
cavity, empty, vacuous

KONG1, QIAN2, JUE2, HOU4
unprecedented and never to be duplicated, the first and the last, unmatched, unique

KONG1, XIANG3
daydream, fantasy, to fantasize

KONG1, XU1
hollow, emptiness, meaningless

KONG4, BAI2
blank space

KONG4, XI4
crack, gap between two objects, gap in time between two events

TAI4, KONG1
outer space