monster
nounUK /ˈmɒn.stər/
US /ˈmɑːn.stɚ/
A monster is a big, scary make-believe creature.
The little boy thought a monster was hiding under his bed.
OTHER MEANINGS
2. A very cruel or evil person.
The cruel king was called a monster by his people.
3. A very large or powerful thing of its kind.
That truck is a monster on the road.
4. Something that is extremely ugly or frightening to look at.
The storm left a monster of a wave behind.