Is after the underlined word? If so, it'd be a preposition. It's followed by a noun.
The literary term would be an oxymoron. Oxymorons are “a figure of speech in which apparently contradictory terms appear in conjunction (e.g. faith unfaithful kept him falsely true ).”
Hello.
The answer is 'better'.
The comparative form of 'good' is better, not 'gooder'.
Hope I helped.
