Monk
A man who devotes his life to religion
Nuns
A woman who devotes her life to religion
Monastery
A community a monk lives in
Convent
A community a nun lives in
Missionary
a person sent on a religious mission, especially one sent to promote Christianity in a foreign country.
Monarch
Highest role
Serf
Lowest role
Knight
Middle role and a experienced fighter
Chivalry
The medieval knightly system with its religious, moral, and social code.
Guild
a medieval association of craftsmen or merchants, often having considerable power.