belonging to the speaker

a place where minerals are extracted

खदान

English Usage: They worked in the coal mine.

Hindi Usage: वे कोयला खदान में काम करते थे।

the top covering of a building

a protective cover or surface

छत

English Usage: They put a roof over the car to protect it.

Hindi Usage: उन्होंने कार को बचाने के लिए उसके ऊपर छत लगाई।