every year vs annually

every year and annually both are adverbs.

Word	Noun	Adjective	Verb	Adverb
every year	No	No	No	Yes
annually	No	No	No	Yes

As adverbs, every year and annually are synonyms defined as:

Other synonyms of every year include each year, yearly.

every year (adverb)	annually (adverb)
without missing a year	without missing a year
	by the year; every year (usually with reference to a sum of money paid or received)