misdemeanour vs infraction

misdemeanour and infraction both are nouns.

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

As nouns, misdemeanour and infraction are synonyms defined as:

Other synonyms of misdemeanour include infringement, misdemeanor, violation.

misdemeanour (noun)	infraction (noun)
a crime less serious than a felony	a crime less serious than a felony