Noun

• S: (n) plug-in, add-on (a software module that extends or enhances the capabilities of an existing application)
• direct hypernym / inherited hypernym / sister term
• S: (n) addition, add-on, improver (a component that is added to something to improve it) "the addition of a bathroom was a major improvement"; "the addition of cinnamon improved the flavor"
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• derivationally related form
• S: (n) accessory, appurtenance, supplement, add-on (a supplementary component that improves capability)
• direct hyponym / full hyponym
• direct hypernym / inherited hypernym / sister term
• S: (n) component, constituent, element (an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system) "spare components for cars"; "a component or constituent element of a system"
• derivationally related form