or else vs alternatively

or else and alternatively both are adverbs.

Word	Noun	Adjective	Verb	Adverb
or else	No	No	No	Yes
alternatively	No	No	No	Yes

As adverbs, or else and alternatively are synonyms defined as:

Other synonyms of or else include instead.

or else (adverb)	alternatively (adverb)
in place of, or as an alternative to	in place of, or as an alternative to