The term 'title of nobility' refers to a set of titles that are given to individuals in certain countries, usually as a sign of honor or recognition. The four crossword solutions for this term are EARL (4 letters), BARON (5 letters), SIR (3 letters), and LORD (4 letters). An EARL is a British nobleman ranking above a viscount and below a marquess. A BARON is a title of nobility, ranking below a viscount and above a knight. A SIR is a title of honor used before the name of a knight or baronet. Lastly, a LORD is a title of respect for a person of high social rank, especially a peer in the United Kingdom.