The List
There are 139 4 letter words with G as the last letter. The highest scoring is ZING at 14 points in Scrabble, though Words With Friends prefers JAGG at 17.
AGOGAREGBANGBERGBIGGBINGBIOGBLAGBLOGBONGBOYGBRAGBRIGBROGBUNGBURGCANGCHOGCHUGCLAGCLEGCLOGCRAGCROGDANGDARGDINGDONGDRAGDREGDRUGDUNGFANGFLAGFLEGFLOGFRAGFRIGFROGFRUGFUNGGANGGINGGLEGGLUGGONGGOOGGRIGGROGGUNGHAGGHANGHINGHOGGHONGHUNGJAGGJONGKANGKINGKNAGLANGLENGLINGLONGLUNGMAGGMANGMARGMENGMIGGMINGMONGMUGGMUNGNANGNOGGNONGPANGPEAGPINGPLUGPONGPRIGPROGPUNGQUAGRAGGRANGRIGGRINGRONGRUNGSAAGSANGSCAGSCOGSCUGSHOGSINGSKAGSKEGSKUGSLAGSLOGSLUGSMOGSMUGSNAGSNIGSNOGSNUGSONGSPAGSPUGSTAGSUNGSWAGSWIGTAIGTANGTEGGTHIGTHUGTINGTONGTRIGTROGTRUGTUNGTWIGVANGVLOGVUGGWHIGWINGYANGYEGGZING