Fountain-pen, a writing instrument that uses a nib and an ink reservoir to produce writing, has numerous synonyms. Some of the commonly used synonyms for fountain-pens are ink pens, dip pens, quill pens, feather pens, calligraphy pens, and writing quills. Ink pens are the most common synonym for fountain-pens, and they have various ranges from disposable pens to high-end decorative pens. Dip pens are another synonym for fountain-pens, and they rely on the use of ink wells in the writing process. Quill pens and feather pens refer to the traditional writing tools made from bird feathers that were used before the invention of modern fountain-pens. Finally, calligraphy pens and writing quills refer to specialty writing instruments that are used for specific writing purposes.