is a specific kind of: allow, countenance, let, permit.

is a broader term that covers: repatriate | readmit.

verb group: admit.

is the opposite of: refuse, reject, turn away, turn down.

derivation: insertion, introduction, intromission | admission, admittance | admission, admission charge, admission fee, admission price, entrance fee, entrance money, price of admission | admittable, admittible.