and so forth vs etc.

and so forth and etc. both are adverbs.

Word	Noun	Adjective	Verb	Adverb
and so forth	No	No	No	Yes
etc.	No	No	No	Yes

As adverbs, and so forth and etc. are synonyms defined as:

Other synonyms of and so forth include and so on, etcetera.

and so forth (adverb)	etc. (adverb)
continuing in the same way	continuing in the same way