According to the Official Scrabble Players Dictionary, 4th Edition, there are seven words that end with the letter 'j', and the only vowel found in each of them is the letter 'a'.
Not in any dictionary I tried (two of which contain over 250,000 words each).
orlit
Some Scrabble words that end with O are:banjocockatoocombocommandocuriododominodumbodynamoechogizmogogoohalohelloherokangarookazookiddokilokimonomemonopatiopeekaboopotatoradiorodeosotattoototomatotootornadotorsotriovetovideovirtuosowhowooyahoozerozoo
Some words ending in the vowel O are:bongobravohalohelloherojellopianopolopotatoshampoosilosolotattootomatoweirdozero
jo jeoeo fo EDIT: There are no Scrabble legal words that start with J, end in O, and are only three letters long.
According to the Official Scrabble Players Dictionary, 4th Edition, there are seven words that end with the letter 'j', and the only vowel found in each of them is the letter 'a'.
Not in any dictionary I tried (two of which contain over 250,000 words each).
jack-o'-lantern if you wanted three words, jack-of all-trades if you wanted three hyphens as well
orlit
Some Scrabble words that end with O are:banjocockatoocombocommandocuriododominodumbodynamoechogizmogogoohalohelloherokangarookazookiddokilokimonomemonopatiopeekaboopotatoradiorodeosotattoototomatotootornadotorsotriovetovideovirtuosowhowooyahoozerozoo
Some words ending in the vowel O are:bongobravohalohelloherojellopianopolopotatoshampoosilosolotattootomatoweirdozero
hobo
Some words beginning with the letters POO:PoochPoodlePoofPoohPoolPoolroomPoolsidePoorPoorhousePoorlyPoos
m a j o r
chaquitaa
outlook, oarlock