Both, Either, Neither, All, Each, Every, None
These are quantifiers that help describe the amount of something. 'Both' refers to two things, 'either' refers to one of two things, 'neither' refers to none of two things, 'all' refers to everything, 'each' refers to every individual thing, 'every' refers to all members of a group, and 'none' refers to no members of a group.