"I can not remember another word for "War Horse" it starts with a C ... I know that much, but I cant remember the whole name. If you could help me with this, I would be greatful, thank you. -Abby"

Both "Charger" (a cavalry horse) and "Courser" (a swift horse or charger) are words for war horses. "Destrier" is an archaic term for 'war horse', from Latin dexter, meaning right, as Destriers were lead on the right side until they were needed for battle or tournament. The "Palfrey", or light-riding horse, was used during marches, or as a lady's riding horse (it too is an archaic term).
Some other related war-horse words:
"Chamfrain", also spelled "Chamfron" or "champfrain", was armor for the horse's face. "Caparisons” or “Bards" were cloth, leather, or mail cloaks that the horses wore for protection, or just as ornaments. A “crinet” guarded the horse's neck, and “flanchards” protected its flanks. A "Capel" is a medieval farming horse.