boarder

nouns

a tenant in someone's house
boarder, lodger, roomer
is derived from
board
someone who forces their way aboard ship
"stand by to repel boarders"
boarder
is derived from
board
is a type of (narrower)
someone who intrudes on the privacy or property of another without permission
interloper, intruder, trespasser
a pupil who lives at school during term time
boarder
is derived from
board
is derived from
board
is a type of (narrower)
a young person attending school (up through senior high school)
pupil, school-age child, schoolchild