The term Celtic Rival is composed of four words, each with a different number of letters. The first word is NET, which has three letters. This word is a noun that refers to a mesh of strong, interwoven cords or wires. The second word is PACER, which has five letters. This word is a noun that refers to a horse trained to move at a steady speed in harness racing. The third word is DRUID, which has five letters. This word is a noun that refers to a member of an ancient Celtic priestly class. The fourth word is ERSE, which has four letters. This word is a noun that refers to the language spoken by the Scottish and Irish people, which is also known as Gaelic. Together, these four words form the term Celtic Rival, which is used to refer to the rivalry between the Celts and other cultures.