malarky vs malarkey

malarky and malarkey both are nouns.

Word	Noun	Adjective	Verb	Adverb
malarky	Yes	No	No	No
malarkey	Yes	No	No	No

As nouns, malarky and malarkey are synonyms defined as:

Other synonyms of malarky include idle words, jazz, nothingness, wind.

malarky (noun)	malarkey (noun)
empty rhetoric or insincere or exaggerated talk	empty rhetoric or insincere or exaggerated talk