Slip of the tongue and Slip-up

Slip of the tongue noun - An accidental and usually trivial mistake in speaking.

Slip-up and slip of the tongue are semantically related In some cases you can use "Slip-up" instead a noun phrase "Slip of the tongue".

Slip-up noun - A minor inadvertent mistake usually observed in speech or writing or in small accidents or memory lapses etc..

Slip of the tongue and slip-up are semantically related in mistake topic. You can use "Slip of the tongue" instead a noun phrase "Slip-up", if it concerns topics such as error.