Insure
Part of speech: verb
Definition: To provide for compensation if some specified risk occurs. Often agreed by policy (contract) to offer financial compensation in case of an accident, theft or other undesirable event. To deal in such contracts; subscribe to a policy of insurance To make sure or certain of; guarantee. To give confidence in the trustworthiness of.
Assure
Part of speech: verb
Definition: To make sure and secure.To give (someone) confidence in the trustworthiness of (something).To guarantee, promise (to do something).To reassure.
Example sentence: Stand firm in your refusal to remain conscious during algebra. In real life, I assure you, there is no such thing as algebra.