許可【きょか】
permission, approval, authorization, license
許す【ゆるす】
to permit, to allow, to approve, to consent to, to forgive, to pardon, to excuse, to tolerate, to exempt (someone) from, to remit, to release, to let off, to acknowledge, to admit, to trust, to confide in, to let one's guard down, to give up (points in a game, distance in a race, etc.), to yield
免許【めんきょ】
license, licence, permission, permit, certificate
特許【とっきょ】
patent, special permission, license, licence, concession, charter
許諾【きょだく】
consent, assent, approval, permission
許容【きょよう】
permission, allowance, acceptance, tolerance, pardon