The term PEN FILL can be broken down into two crossword solutions: INK (3 letters) and CONS (4 letters). INK is a liquid or paste that contains pigments or dyes and is used to color a surface to produce an image, text, or design. It is most commonly used for writing, drawing, and printing. CONS are short for 'consumables, ' which are items that are used up or consumed during the course of a job or task. Consumables are typically used in manufacturing and industrial processes and include items such as lubricants, adhesives, and cleaning supplies.