hilarity

Ecstasy is a related term of hilarity.

As a proper noun ecstasy

is (slang) the drug mdma, a synthetic entactogen of the phenethylamine family.

As a noun hilarity is

(uncountable) a great amount of amusement, usually accompanied by laughter.

Hilarity is a related term of sportiveness.

As nouns the difference between hilarity and sportiveness

is that hilarity is (uncountable) a great amount of amusement, usually accompanied by laughter while sportiveness is the state of being sportive.

Hilarity is a related term of jocularity.

As nouns the difference between hilarity and jocularity

is that hilarity is (uncountable) a great amount of amusement, usually accompanied by laughter while jocularity is joking, humorous remarks or behaviour.

As nouns the difference between taxonomy and hilarity

is that taxonomy is the science or the technique used to make a classification while hilarity is (uncountable) a great amount of amusement, usually accompanied by laughter.

As nouns the difference between hilarity and uproariousness

is that hilarity is (uncountable) a great amount of amusement, usually accompanied by laughter while uproariousness is noisy riot or hilarity; uproar.

As a noun hilarity

is (uncountable) a great amount of amusement, usually accompanied by laughter.

As an adjective unhilarious is

not hilarious; devoid of hilarity.