Speech errors, referred to as slip of the tongue, are categorized into at least18 types.
A speech error, commonly referred to as a slip of the tongue (Latin: lapsus linguae, or occasionally self-demonstratingly, lipsus languae) or misspeaking, is a deviation (conscious or unconscious) from the apparently intended form of an utterance. Types of speech errors Addition Anticipation Blends Deletion Exchange Lexical selection error Malapropism, classical Metathesis Morpheme-exchange error Morpheme stranding Omission Perseveration Shift Residual Speech Errors Sound-exchange error Spoonerism Substitution Word-exchange error 
