infraction vs violation

infraction and violation both are nouns.

Word	Noun	Adjective	Verb	Adverb
infraction	Yes	No	No	No
violation	Yes	No	No	No

As nouns, infraction and violation are synonyms defined as:

Other synonyms of infraction include infringement, misdemeanor, misdemeanour.

infraction (noun)	violation (noun)
a crime less serious than a felony	a crime less serious than a felony
	entry to another's property without right or permission
	the crime of forcing a person to submit to sexual intercourse against his or her will
	a disrespectful act
	an act that disregards an agreement or a right