Molehill (noun)

1. A small, inconsequential problem or issue.
2. A small pile of earth raised by a mole as it burrows underground.

Origin:

Derived from the middle english word 'mollehill' meaning 'hill made by moles'.

Examples:

1. He refused to get worked up over a molehill of a problem.
2. She had a tendency to make a molehill out of a minor issue.
3. The mole had raised several molehills in the garden as it dug its burrow.
4. The molehill was a telltale sign of the mole's presence in the area.
5. The molehills marred the otherwise perfect lawn.