mole·hill 
/ˈmoʊlˌhɪl/ noun
plural mole·hills /ˈmoʊlˌhɪl/ noun [count] : a small pile of dirt that is pushed up by a mole when it digs tunnels underground
make a mountain out of a molehill
: to make something seem much more difficult or important than it really is
▪ She thought that he was making a mountain out of a molehill by complaining about the placement of the silverware.
▪ She thought that he was making a mountain out of a molehill by complaining about the placement of the silverware.
