Similar word to permission:
acceptance, acknowledgment, acquiescence, admission, agreement, allowance, approbation, approval, assent, avowal, canonization, carte blanche, concession, concurrence, condonance, condonation, dispensation, empowerment, endorsement, freedom, imprimatur, indulgence, leave, letting, liberty, license, okay, permit, privilege, promise, recognition, rubber stamp, sanctification, sanction, stamp of approval, sufferance, tolerance, toleration, verification, warrant
acceptance, acknowledgment, acquiescence, admission, agreement, allowance, approbation, approval, assent, avowal, canonization, carte blanche, concession, concurrence, condonance, condonation, dispensation, empowerment, endorsement, freedom, imprimatur, indulgence, leave, letting, liberty, license, okay, permit, privilege, promise, recognition, rubber stamp, sanctification, sanction, stamp of approval, sufferance, tolerance, toleration, verification, warrant