craziness vs lunacy

craziness and lunacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
craziness	Yes	No	No	No
lunacy	Yes	No	No	No

As nouns, craziness and lunacy are synonyms defined as:

Other synonyms of craziness include folly, foolery, indulgence, tomfoolery.

craziness (noun)	lunacy (noun)
foolish or senseless behavior	foolish or senseless behavior
the quality of being rash and foolish	obsolete terms for legal insanity
informal terms for insanity