Who are Ford's competitors?

Most other car companies. General Motors, Chrysler, Toyota USA, Nissan, Infiniti, Porsche, Lamborghini, etc. All of those. Below are some competitors for certain Ford vehicles.

F-150 ~ ~ ~ Chevy Silverado 1500, Dodge Ram 1500, Toyota Tundra, Nissan Titan

Mustang ~ ~ ~ Chevy Camaro, Dodge Charger/Challenger, Chevy Corvette (GT500 competitor)

Fusion ~ ~ ~ Chevy Malibu, Chevy Impala, Toyota Camry, Honda Accord

.... and so on and so on.....