pusher vs intruder

pusher and intruder both are nouns.

Word	Noun	Adjective	Verb	Adverb
pusher	Yes	No	No	No
intruder	Yes	No	No	No

As nouns, intruder is a hypernym of pusher; that is, intruder is a word with a broader meaning than pusher:

pusher: one who intrudes or pushes himself forward
intruder: someone who intrudes on the privacy or property of another without permission

Other hypernyms of pusher include interloper, trespasser.

pusher (noun)	intruder (noun)
a small vehicle with four wheels in which a baby or child is pushed around	someone who intrudes on the privacy or property of another without permission
a sandal attached to the foot by a thong over the toes
someone who pushes
an unlicensed dealer in illegal drugs
one who intrudes or pushes himself forward