longwise vs longways

longwise is not a noun while longways is a noun.

Word	Noun	Adjective	Verb	Adverb
longwise	No	No	No	Yes
longways	Yes	No	No	Yes

As adverbs, longwise and longways are synonyms defined as:

Other synonyms of longwise include lengthways, lengthwise, longitudinally.

longwise (noun)	longways (noun)
	country dancing performed with couples in two long lines facing each other

longwise (adverb)	longways (adverb)
in the direction of the length	in the direction of the length