at last vs ultimately

at last and ultimately both are adverbs.

Word	Noun	Adjective	Verb	Adverb
at last	No	No	No	Yes
ultimately	No	No	No	Yes

As adverbs, at last and ultimately are synonyms defined as:

Other synonyms of at last include at long last, finally, in the end.

at last (adverb)	ultimately (adverb)
as the end result of a succession or process	as the end result of a succession or process