afterwards vs subsequently

afterwards and subsequently both are adverbs.

Word	Noun	Adjective	Verb	Adverb
afterwards	No	No	No	Yes
subsequently	No	No	No	Yes

As adverbs, afterwards and subsequently are synonyms defined as:

afterwards and subsequently: happening at a time subsequent to a reference time

Other synonyms of afterwards include after, afterward, later, later on.

afterwards (adverb)	subsequently (adverb)
happening at a time subsequent to a reference time	happening at a time subsequent to a reference time