Expulsion vs Rusticate - What's the difference?

As a noun expulsion

is expulsion.

(british) to suspend or expel from a college or university.

(wikipedia expulsion)

(en noun)

The act of expelling or the state of being expelled.

The scandal involved every member of the high school's football team resulting in a flurry of expulsions , starting with the quarterback.

* impulsion

(rusticat)

(British) To suspend or expel from a college or university.

To construct in a manner so as to produce jagged or heavily textured surfaces.

To compel to live in or to send to the countryside; to cause to become rustic.

To go to reside in the country.

(Alexander Pope)