A delusion of acidheads
A blathering of pundits
An obscenity of Republicans.
A backpatting of democrats
A decolletage of dowagers
An impediment of regulators
A mutation of Habsburgs
A re-enactment of cosplayers
A cite of Dopers?
Not my own work, but I did once hear of three London prostitutes referred to as a trey of tarts, a fanfare of strumpets, and an anthology of English pros.
A cacophony of cyclists.
An argument of Dopers.
A dose of toxicologists.
A deadlock of politicians
-“BB”-
A bend of saxophonists
A fire of Jabberwocks
A portmanteau of collective nouns
A shell of a lot of turtles.
A truly great simile of metaphors
A _ of Minimalists