leastwise vs at least

leastwise and at least both are adverbs.

Word	Noun	Adjective	Verb	Adverb
leastwise	No	No	No	Yes
at least	No	No	No	Yes

As adverbs, leastwise and at least are synonyms defined as:

leastwise and at least: if nothing else (`leastwise' is informal and `leastways' is colloquial)

Other synonyms of leastwise include at any rate, leastways.

leastwise (adverb)	at least (adverb)
if nothing else (`leastwise' is informal and `leastways' is colloquial)	not less than
	if nothing else (`leastwise' is informal and `leastways' is colloquial)