betrayer vs beguiler

betrayer and beguiler both are nouns.

Word	Noun	Adjective	Verb	Adverb
betrayer	Yes	No	No	No
beguiler	Yes	No	No	No

As nouns, beguiler is a hypernym of betrayer; that is, beguiler is a word with a broader meaning than betrayer:

Other hypernyms of betrayer include cheat, cheater, deceiver, slicker, trickster.

betrayer (noun)	beguiler (noun)
a person who says one thing and does another	a person who charms others (usually by personal attractiveness)
one who reveals confidential information to the police or other authority	someone who leads you to believe something that is not true