This is the 149th most frequent Hindi word.
सच
Truth.
In this sentence, 'सच' is used as a noun meaning 'truth'.
सच हमेशा कड़वा होता है।
Truth is always bitter.
In this sentence, 'सच' is used as an adjective meaning 'true'.
क्या यह सच है कि वह प्रतियोगिता जीत गया?
Is it true that he won the competition?
Here 'सच' is used as a noun indicating 'the truth'.