gatecrasher vs crasher

gatecrasher and crasher both are nouns.

Word	Noun	Adjective	Verb	Adverb
gatecrasher	Yes	No	No	No
crasher	Yes	No	No	No

As nouns, gatecrasher and crasher are synonyms defined as:

gatecrasher and crasher: someone who gets in (to a party) without an invitation or without paying

Other synonyms of gatecrasher include unwelcome guest.

gatecrasher (noun)	crasher (noun)
someone who gets in (to a party) without an invitation or without paying	someone who gets in (to a party) without an invitation or without paying