VALID - [adjective] that can be legally used at a certain time; authoritative; well-founded

Examples of use

Your bus ticket is valid for three months starting now.

I'm sorry, Sir, we must keep your car. Your driving licence is no longer valid.

REVENGE - [noun] an action taken against someone who has done something to harm you

Examples of use

Her flat was burnt in revenge for informing the police on what she saw last night.

All he wants now is to take revenge on whoever killed his beloved wife.