| accessory(noun, extra, addition, attachment, decoration) |
| supplement(noun, increase, extra, addition, attachment) |
| addition(noun, increase, extra, attachment, decoration) |
| appurtenance(noun, extra, addition, attachment, decoration) |
| extension(noun, increase, treat, extra, extravagance) |
| improver |
| adjunct(noun, increase, extra, addition, attachment) |
| extra(noun, adjective, increase, addition, additional) |
| accoutrement(noun, extra, addition) |
| addendum(noun, increase, extra, addition, attachment) |
| additive(noun, increase, extra, addition, ingredient) |
| affix(noun, addition, supplement) |
| after-market item |
| appendage(noun, increase, extra, addition, attachment) |
| appendix(noun, increase, extra, addition, attachment) |
| attached item |
| attachment(noun, extra, addition, decoration, supplement) |
| gain(noun, extra, supplement, appendage) |
| postscript(noun, increase, extra, addition, supplement) |
| suffix |