Goblin (noun)

1. A mischievous or ugly dwarf that is believed to haunt underground places such as mines or caves.
2. A small, ugly, or grotesque creature.

Origin:

The origin of the word goblin is uncertain, it may derive from the germanic word "kobold" or from the french word "gobelin", originally meaning a mischievous elf or sprite.

Examples:

1. The miners believed that goblins lived in the depths of the mine.
2. The children were told that if they were not good, the goblins would come and get them.
3. The goblin in the fairy tale was known for playing tricks on humans.
4. The goblin king was a fearsome ruler.
5. The goblin market is a place where strange and unusual things can be bought and sold.