Answer:

reo

Answer	Crossword Clue
REO	Old auto with its founder's monogram
REO	Pierce-Arrow competitor
REO	Old car that's a homophone of another answer in this puzzle

REO	... Speedwagon
REO	... Speed Wagon (old truck)
REO	Bygone car company that bore its founder's initials
REO	Alternative to a Maxwell
REO	Vintage car inits.
REO	Car that went defunct in 1936
REO	Competitor of the Essex or Hupmobile
REO	... Speed Wagon (old vehicle)

REO	1920s car
REO	Maker of the old Speed Wagon
REO	Royale carmaker of old
REO	Classic car inits.
REO	Early automotive inits.
REO	Diamond ... Trucks (bygone company)
REO	1920s car that had its inventor's initials
REO	Old car that's an anagram of 41-Down

REO	U.S. truck maker until the early '50s
REO	Old car make that's a homophone of a modern car model
REO	Flying Cloud of autodom
REO	Classic car whose name is a monogram
REO	Flying Cloud of old autodom
REO	Royale maker
REO	Vintage wheels
REO	Vintage vehicle

REO	Old touring car
REO	Maxwell rival
REO	Old bus maker
REO	Flying Cloud maker
REO	Locomobile competitor
REO	Auto monogram
REO	Classic auto
REO	Auto last made in 1936

REO	Old autodom's Model M or Model T-6
REO	Flying Cloud automaker
REO	Flying Cloud of 1927-36
REO	Automotive inits.
REO	Franklin contemporary