According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 14 words with the pattern --UGS. That is, five letter words with 3rd letter U and 4th letter G and 5th letter S. In alphabetical order, they are:
chugs
drugs
frugs
glugs
jougs
plugs
scugs
skugs
slugs
smugs
snugs
spugs
thugs
trugs