endwise vs end on

endwise and end on both are adverbs.

Word	Noun	Adjective	Verb	Adverb
endwise	No	No	No	Yes
end on	No	No	No	Yes

As adverbs, endwise and end on are synonyms defined as:

Other synonyms of endwise include endways.

endwise (adverb)	end on (adverb)
with the end forward or toward the observer	with the end forward or toward the observer
in or toward the direction of the ends; lengthwise
on end or upright