supplement (n.)
- accession
- accessory
- accident
- accidental
- accompaniment
- addendum
- addition
- additive
- adjunct
- adjuvant
- afterthought
- annex
- annexation
- appanage
- appendage
- appendix
- appurtenance
- attachment
- augmentation
- auxiliary
- chorus
- coda
- codicil
- collateral
- colophon
- complement
- conclusion
- concomitant
- consequence
- contingency
- contingent
- continuance
- continuation
- corollary
- envoi
- epilogue
- extension
- extra
- extrapolation
- fixture
- follow-through
- follow-up
- happenstance
- incidental
- increase
- increment
- inessential
- insert
- nonessential
- offshoot
- other
- pendant
- peroration
- postfix
- postlude
- postscript
- recruit
- refrain
- reinforcement
- rider
- secondary
- sequel
- sequela
- sequitur
- subscript
- subsidiary
- suffix
- supplementation
- tag
- tailpiece
