The collective noun for teachers is staff!!!!!!!!.
staff It can also be Faculty.
There could be a boredom of teachers that is possible, my teacher gave me that example on my homework but now im not allowed to use it :( anyway hope it helps xActually the answer is "blackboard of...
Only one -- herd of goats
"harras", "herd", "stable", "team", "troop" and "harass"