All are rodents or rat family, except cat.

Cretinism is a hormonal disease while rest are deficiency diseases.

Cotton is fiber crop. Rest are food crop.

Trivial describes something which is off little value or importance whereas rest of words describe the physical size of objects.

Rest are the parts of a circle.

All are the capitals of the states.

All except think are functions performed by sense organs of the body.

All are pricky substances.

Lotus grow on land.

All are related with earthequake, except crater which is a circular depression in the ground caused by volcanic activity.