The term 'PEN PART' can be broken down into three separate words: NIB (3 letters), CELL (4 letters), and POINT (5 letters). A NIB is the metal tip of a fountain pen, which is used to write with. A CELL is a small compartment or chamber, such as the ink reservoir in a fountain pen. Finally, a POINT is the tip of a writing instrument, such as a fountain pen. Together, these three words make up the term 'PEN PART, ' which refers to the components of a fountain pen.