Collective Nouns

Is there a collective noun for mothers?
 
An accumulation?
 
A segregation?
 
A judgement? A liberation?
 
A grieving? A receiving? 
An emptiness? A bleeding? 
 
An exhaustion. An imperfection.
An abandon. A rejection. 
 
A yawn. An aching. A reflection.
A scarring. A tearing. A concern.
A caution. A disproportion. An idolatry.
 
A learning?
 
An exasperation. A personification. A regret. 
An ammunition? A juxtaposition? 
 
A breath. A suffocation. 
 
A deliberation.
 
A chance.