Euphemism
A euphemism (/ˈjuːfəmɪzəm/ YOO-fə-miz-əm) is when an expression that could offend or imply something unpleasant is replaced with one that is agreeable or inoffensive. Some euphemisms are intended to amuse, while others use bland, inoffensive terms for concepts that the user wishes to downplay. Euphemisms may be used to mask profanity or refer to topics some consider taboo such as mental or physical disability, sexual intercourse, bodily excretions, pain, violence, illness, or death in a polite way.