crackup

As nouns the difference between crackup and laugh

is that crackup is a breakdown while laugh is an expression of mirth particular to the human species; the sound heard in laughing; laughter.

As a verb laugh is

(label) to show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.

As a verb unhinge

is to mentally disturb.

As a noun crackup is

a breakdown.

As nouns the difference between cackle and crackup

is that cackle is the cry of a hen or goose, especially when laying an egg while crackup is a breakdown.

As a verb cackle

is to make a sharp, broken noise or cry, as a hen or goose does.