There are 16,687 words ending in "g", at least in one dictionary. Here's one example:
annoying
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Some words that start with G and end with Y are:gabbygalaxygalleygaudygaygenealogygentlygeographygeologygeometryghastlyghostlygigglygiddygingerlyglorygoodygoofygorygraduallygravellygravelygravitygravygraygreedygullygummyguppyGuy
Wyoming
nagnaggingnauseatingnationalizingnavigatingnailingneckingnettingneedingnearingnestingnestlingnippingnothingnonthreateningnourishingnonbindingnonlivingnonpollutingnonpracticingnonspeakingnosingnumbingnoddingnursingnutmegnurturingnuzzlingnumbering
ag.
Herring, pudding.