A claw of jewellers
A romance of stonemasons
A stick of models
A cloud of smokers
A wedge of woodworkers
Zyada says it should be:
A palette of painters
And suggests:
A byte of programmers, or
A gig of programmers,
(depending on the size of the group).
A wunch of bankers.
A cubicle of office workers
Chemist: What are you looking for?
Marcus Vindictus (looking for warriors in Trojan armor): “A pack of Trojans!”
Chemist: “Gee, I just ran out!”
You could easily find a mole of laywers.
A standard of deviates.
A juvenile of delinquents
A brat of toddlers
A sigma of statisticians
As an engineer and a chemist, I give this two thumbs up! 
Also consider -
A Solution of Chemists
A Production of Engineers
A stigma of prostitutes.
A giggle of blondes
A crash of percussionists
A scope of snipers
A call of umpires
A catch of jugglers
A flourish of magicians
A babble of auctioneers
A peil of pizza-makers
A confederacy of civil-war enthusiasts
A gawk of bird-watchers
A Mbf of foresters
A churn of dairymen
ummm…
A dose of toxicologists
As a language nerd, I’m getting way more enjoyment out of this thread than should be possible. I can’t stop grinning.
Thanks for a great OP, Crab Rangoon. And if this is indeed your first post - well done. Very well done.
A package of postal workers.
A bribe of politicians
I disagree with your last example, An Aquifer of Hydrologists. An aquifer refers to to a layer of rock, which unlike your other references, has no numerical or quantitative value that can be associated with it. How about an infiltration of hydrologists?
Aww shucks - though truth be told - it may just be that this was the first good idea that I’ve had! Once you get started on these - it’s just so hard to stop.
I see. You are right - I’ll see your Infiltration of Hydrologists and raise you a Plume of Hydrologists - or would we need to go with a Plume of Hydrogeologists?
I’m not sure I get this one. Is it that you’re only getting a snippet of the whole, real thing? Or does “titute” sound like a word I’m unfamiliar with? (hmm, never noticed that ‘prostitutes’ have 'tit’s, before.)
No, it’s “prose” that sounds like another word; those who follow the oldest profession.