Stayer

n.

1.

One who upholds or supports that which props; one who, or that which, stays, stops, or restrains; also, colloquially, a horse, man, etc., that has endurance, as in a race.

Noun

1.

stayer - a person or other animal having powers of endurance or perseverance; "the horse that won the race is a good stayer"

animal, animate being, beast, brute, creature, fauna, last out, outride, ride out, stay