lunacy vs tomfoolery

lunacy and tomfoolery both are nouns.

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

As nouns, lunacy and tomfoolery are synonyms defined as:

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

lunacy (noun)	tomfoolery (noun)
foolish or senseless behavior	foolish or senseless behavior
obsolete terms for legal insanity