type of:

benefactor, helper

a person who helps people or institutions (especially with financial help)

types:

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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

addendum

a thing that is added or will be added

adjuvant

an additive that enhances the effectiveness of medical treatment

ell

an extension at the end and at right angles to the main building

artificial additive, food additive

an additive to food intended to improve its flavor or appearance or shelf-life

hood, lens hood

a tubular attachment used to keep stray light out of the lens of a camera

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