each year vs p.a.

each year and p.a. both are adverbs.

Word	Noun	Adjective	Verb	Adverb
each year	No	No	No	Yes
p.a.	No	No	No	Yes

As adverbs, each year and p.a. are synonyms defined as:

each year and p.a.: by the year; every year (usually with reference to a sum of money paid or received)

Other synonyms of each year include annually, per annum, per year.

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