oftentimes vs often

oftentimes and often both are adverbs.

Word	Noun	Adjective	Verb	Adverb
oftentimes	No	No	No	Yes
often	No	No	No	Yes

As adverbs, oftentimes and often are synonyms defined as:

Other synonyms of oftentimes include frequently, oft, ofttimes.

oftentimes (adverb)	often (adverb)
many times at short intervals	many times at short intervals
	frequently or in great quantities
	in many cases or instances