intruder

1 ENTRIES FOUND:
intruder /ɪnˈtruːdɚ/ noun
plural intruders
intruder
/ɪnˈtruːdɚ/
noun
plural intruders
Britannica Dictionary definition of INTRUDER
[count]
1 
: a person who is not welcome or wanted in a place
2 
: a person who enters a place illegally