As nouns the difference between goader and gooder
is that goader is one who goads while gooder is nominalization of good.
As an adjective gooder is
comparative of good.
gooder
English
Adjective
(head)
(nonstandard, humorous) (good)
Usage notes
The correct comparative is (better)
See also
* do-gooder
Noun
(
en noun)
(nonstandard, humorous) nominalization of good
Usage notes
New England slang, as in: "You're a gooder, for taking care of your mom."
A parallel construction to oner, a nominalization of one, to mean "an outstanding person or thing."[http://www.thefreedictionary.com/oner]