add-on

1. A software module that extends or enhances the capabilities of an existing application (synset 106578832)
   is a type of: computer software, package, software, software package, software program, software system - (computer science) written programs or procedures or rules and associated documentation pertaining to the operation of a computer system and that are stored in read/write memory
   same as: plug-in
2. A component that is added to something to improve it (synset 102682269)
   "the addition of a bathroom was a major improvement"; "the addition of cinnamon improved the flavor"
   is a type of: 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
   subtypes:

   • additive - something added to enhance food or gasoline or paint or medicine
   • afterthought - an addition that was not included in the original plan
   • annex, annexe, extension, wing - an addition that extends a main building
   • attachment - a supplementary part or accessory
   • elongation, extension - an addition to the length of something
   same as: addition, improver
3. A supplementary component that improves capability (synset 102674051)
   is a type of: 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
   subtypes:

   • auto accessory - an accessory for an automobile
   • computer accessory - an accessory for a computer
   • fitting - a small and often standardized accessory to a larger system
   • fixings, trimmings - the accessories that normally accompany (something or some activity)
   same as: accessory, appurtenance, supplement

Other Searches

• Rhyme: Dillfrog, RhymeZone
• Definition: Wiktionary, Dictionary.com, Wikipedia, Merriam-Webster, WordNet, Power Thesaurus
• Imagery: Google, Flickr, Bing