Other Words for Assure
Assure as a Verb has these synonyms:
Example: What can I do to assure you of my love.
Example: Your humanity assures us and gives us strength.
secure, stabilize, settle, establish, confirm, certify, warrant, guarantee, ensure, be confident of, make or be sure or certain
Example: Force, fear, the multitude of his guard do less to assure the estate of a prince than the good will of his subjects.