An illiterate of barbarians.
A barbershop of bards.
A doorstep of clerics.
A compost of druids.
A single pillar of fighters.
A smack of monks.
A smite of paladins.
A chuck of rangers.
A poof of rogues.
A squirt of sorcerers.
A freeload of warlocks.
A quadratic of wizards.
A Horde of barbarians.
A Band Concerto of bards.
A Congregation of clerics.
A Grove of druids.
A Squadron Forlorn Hope of fighters.
An Order of monks.
A Lance of paladins.
A Troop of rangers.
A Gang of rogues.
A Disaster Sanguinity of sorcerers.
An Apocalypse of warlocks.
An Cataclysm Academy of wizards.
...OK, one of those may have been just a little funny...
A Barrel of Barbarians
A banjo of Bards
A Cull of Clerics
A dreg of druids
A fist of fighters
A mook of monks
A pal of paladins
A range of rangers
A rot of rogues
A sauce of sorcerers
A pad of warlocks
A wizz of wizards.