invader
nounUK /ɪnˈveɪdə/
US /ɪnˈveɪdər/
An invader is someone who comes into a place where they are not wanted.
The soldiers fought bravely against the invaders.
OTHER MEANINGS
2. A person or group that enters a country with an army to take control of it.
The castle was built to protect the town from invaders.
3. An animal or plant that spreads into a new area and causes harm there.
This weed is an invader that chokes out native plants.
4. Someone who enters a place or situation without being invited.
The party crasher was an invader who ruined the celebration.
5. A thing that intrudes on someone's privacy or personal space.
The loud music felt like an invader in their quiet evening.