I want to know if "bêtise" and "sottise" can be used interchangeably. If not, how do they differ?
As long as I know the both can be used interchangeably.
The main difference is the meaning they could take which is very subtle and difficult to explain.
Case where "bêtise" is used
*A childlike misconduct
"bêtise" is also a candy but... well nobody cares
Case where "sottise" is used
After reflexion I would say that sottise is harder than bêtise which is more smooth.
"Tu dis des sottises" > "Tu dis des bêtises"
The main difference is the adjective used to constitute the noun meaning that :
You also have the following synonyms :
So if you want differences betwwen "bêtise" and "sottise" (and "idiotie" & "connerie" too), you will have to look for nuances between the adjectives behind the names.
La principale différence se situe au niveau des adjectifs utilisés pour former le nom :
On peut également citer les synonymes suivants :
Pour trouver les différences de sens entre "bêtise" et "sottise" (mais aussi "idiotie" et "connerie"), il faut donc regarder du côté des nuances de sens entre les adjectifs derrière les noms.