Courtesy of the Merriam-Webster Dictionary
Shibboleth – noun
a. a word or saying used by adherents of a party, sect or belief and usually regarded by others as empty of real meaning ⠀
b. a widely held belief ⠀
c. Truism, Platitude ⠀ ⠀
Ephemeral – adjective⠀
a. Lasting a very short time ⠀
b. Lasting one day only ⠀ ⠀
Malapropism – noun ⠀
a. The usually unintentionally humorous misuse or distortion of a word or phrase; especially to use a word sounding somewhat like the one intended but ludicrously wrong in the context