In an effort to hopefully avoid and further duplication, here is the list of the current contributions:
Tune
moon
goon
prune
pantaloon
poon
june x2
swoon
Dune x2
boon
patoon poonding goon
Loon
buffoon x2
poltroon
spittoon
Spoon
Monsoon
raccoon x2
Saloon
Hoon
Noone
Festoon
doubloon
balloon
falloon
platoon
Maroon
Baboon x2
Muldoon
baboon
Prune
Coon
cocoon
goon
Walloon
picayune x2
lampoon
strewn
harpoon
immune
impugn
inopportune
melocotoon
buffoon
soon
ruin
afternoon
Werewolf!