The crossword solutions for the term CASSIO RIVAL are Iago (4 letters), ANON (4 letters), OTHELLO (7 letters), and Elle (4 letters). Iago is a character in William Shakespeare's play OTHELLO, where he is the villainous ensign of the Moorish general OTHELLO. He is Cassio's rival for the affections of Desdemona, OTHELLO's wife. ANON is a character in the same play, who is a messenger from Venice to Cyprus. OTHELLO is the titular character of the play, a Moorish general in the Venetian army. Elle is a character in the play, who is a lady-in-waiting to Desdemona.