The term 'fighting fowl' is a reference to the sport of cockfighting, which involves two specially bred birds fighting each other in a ring. The crossword solutions for this term are 'cock' (4 letters) and 'cocks' (5 letters). Cockfighting is an ancient sport that has been practiced for centuries in many parts of the world. The birds used in the sport are specially bred for their aggressive behavior and physical strength. They are typically outfitted with sharp spurs on their legs to increase the intensity of the fight.