The term 'AUTO RENTAL GIANT' can be summarized as the crossword solution 'ALAMO', which is a five-letter word. ALAMO is an American car rental company that was founded in 1974 and is now owned by Enterprise Holdings, Inc. It is one of the largest car rental companies in the world, with over 1, 000 locations in the United States, Canada, Europe, Latin America, the Caribbean, Asia-Pacific, Africa, and Australia.