Stable
Like a lot of other English words, we can trace it back to Latin where we find the origins in the word “stare” which means “to stand”. This makes sense, as an adjective it means something firmly fixed, unchanging, amongst other uses to describe medical patients and emotional states. As a noun, it’s a building set apart for animals (typically horses) to stay (or stand) in.
Football fans hear and see the word regularly, it gets thrown around a lot when talking about a team’s backfield. It seems like any team who’s feature back doesn’t get 90% of the team’s carries gets an article written about how they have “The best stable of running backs in the conference/league/universe.