main difference between house of commons and house of lords
Unlike the elected House of Commons, all members of the House of Lords (excluding 90 hereditary peers elected among themselves and two peers who are ex officio members) are appointed. The membership of the House of Lords is drawn from the peerage and is made up of Lords Spiritual and Lords Temporal. The Lords Spiritual are 26 bishops in the established Church of England. Of the Lords Temporal, the majority are life peers who are appointed by the monarch on the advice of the Prime Minister, or on the advice of the House of Lords Appointments Commission. However, they also include some hereditary peers including four dukes.