Part of speech: Noun
someone devoted to the promotion of human welfare and to social reforms
Part of speech: Noun
a component that is added to something to improve it
Example: the addition of a bathroom was a major improvement; the addition of cinnamon improved the flavor
Do-gooder, Humanitarian, Improver, Addition, Add-on
improve – A related word in the same word family.
er – A related word in the same word family.
Some English words are 'fossil words'—they only survive in idioms or fixed phrases.