The term 'VITAMIN UNIT' can be broken down into two words, 'VITAMIN' and 'UNIT'. The word 'PILL' is a four letter solution to the crossword puzzle. A PILL is a small, solid, usually round piece of medication that is taken orally. It is typically made up of a combination of active ingredients and inactive ingredients, such as binders, fillers, and preservatives. Vitamins are essential nutrients that the body needs in order to function properly. VITAMIN pills are a convenient way to get the vitamins that the body needs.