To soothe is to help someone, or something, be calmer.

To use soothe in a sentence, "The mother's voice helped soothe her baby to sleep."

When something is extinct, it means it no longer exists.

To use extinct in a sentence, "The panda bear is endanger of becoming extinct."

Having a sense that you are better than others means that you are arrogant.

To use arrogant in a sentence, "Megan was tired of her friend being arrogant, and always acting like she was better than Megan."

To agree or give permission means to consent.

To use consent in a sentence, "I decided to consent, and allow my mom to to help me."