I would think words ending in:
th, sh ng st ct ck LL ss zz
words ending with double consonants:
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consonant vowel consonant ending in e
coverall
A few words starting and ending with a consonant that have o in the middle are:bogboxboycodcogcotcoycowdogdotfogfoxfobgobgodgothothobhophowjobjotloblotloglowmowmobmodmommopnotnowpowpodpoppotrotrobrodrowsobsodsonsowsoytogtomtontoptottowvowwow
Hobby, hubby, hugged, haggle, hottest and hatter are words. They contain a double consonant.
Double