The Understanding chapter lays out ways to change how the player can refer to objects, but we may not want to wait that long for some of the basic features. Here, for instance, is how to add synonyms that the player can use to refer to an entire kind of object:
Test me with "get barrels / get barrel / muscadet / x casks / x muscadet cask".
Set aside, you rather suspect, for tourists: this chamber is barrel-vaulted stone, lined on each side with casks of aging wine. Discarded brochures here and there advertise Wine Tours of the Loire Valley in three different languages, none of them French.
You can see a Vouvray cask and a Muscadet cask here.
> get barrels
What do you want to get those things from?
> get barrel
Which do you mean, the Vouvray cask or the Muscadet cask?
That's fixed in place.
> x casks
You can't use multiple objects with that verb.
> x muscadet cask
You see nothing special about the Muscadet cask.