avow vs swear

avow and swear both are verbs.

Word	Noun	Adjective	Verb	Adverb
avow	No	No	Yes	No
swear	No	No	Yes	No

As verbs, avow and swear are synonyms defined as:

Other synonyms of avow include affirm, assert, aver, swan, verify.

avow (verb)	swear (verb)
to declare or affirm solemnly and formally as true	have faith or confidence in
admit openly and bluntly; make no bones about	make a deposition; declare under oath
	utter obscenities or profanities
	promise solemnly; take an oath
	to declare or affirm solemnly and formally as true