The term 'Alamo Alternative' refers to two car rental companies, Hertz (5 letters) and Avis (4 letters). Hertz is an American car rental company that was founded in 1918 and is now the second largest car rental company in the world. Avis is also an American car rental company that was founded in 1946 and is now the third largest car rental company in the world. Both Hertz and Avis are popular alternatives to Alamo, a car rental company owned by Enterprise Holdings.