mole·hill 
(mōlhĭl′)
(mōlhĭl′)n.
Idiom: A small mound of loose earth raised by a burrowing mole.
make a mountain out of a molehill
To exaggerate a minor problem.
- Cooper
- cooperage
- cooperate
- cooperation
- cooperationist
- cooperative
- cooperatively
- cooperativeness
- cooperator
- Cooper pair
- Cooper's hawk
- Cooperstown
- co-opt
- co-optation
- co-optative
- co-option
- co-optive
- co-orbital
- coordinate
- coordinate bond
- coordinated universal time
- coordinately
- coordinateness
- coordinate system
- coordinating conjunction