To bring something to an end.

समाप्त करना

English Usage: They are terminating the employee's contract.

Hindi Usage: वे कर्मचारी का अनुबंध समाप्त कर रहे हैं।

The act of ending something.

समाप्ति

English Usage: The termination of the contract was unexpected.

Hindi Usage: अनुबंध की समाप्ति अप्रत्याशित थी।