improver vs do-gooder

improver and do-gooder both are nouns.

Word	Noun	Adjective	Verb	Adverb
improver	Yes	No	No	No
do-gooder	Yes	No	No	No

As nouns, improver and do-gooder are synonyms defined as:

improver and do-gooder: someone devoted to the promotion of human welfare and to social reforms

Other synonyms of improver include humanitarian.

improver (noun)	do-gooder (noun)
a component that is added to something to improve it	someone devoted to the promotion of human welfare and to social reforms
someone devoted to the promotion of human welfare and to social reforms