infraction vs infringement

infraction and infringement both are nouns.

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

As nouns, infraction and infringement are synonyms defined as:

Other synonyms of infraction include misdemeanor, misdemeanour, violation.

infraction (noun)	infringement (noun)
a crime less serious than a felony	a crime less serious than a felony
	an act that disregards an agreement or a right