Pronunciation: [lˈɪspə] (IPA) 
The word "lisper" is spelled with an "s" and not a "c" because the "s" sound is used in the pronunciation. In IPA phonetic transcription, the word is spelled as /ˈlɪspər/. The "s" sound is represented by the symbol /s/ and the "i" sound is represented by the symbol /ɪ/. The "p" sound is represented by /p/ and the "-er" sound is represented by /ər/. Therefore, the spelling of "lisper" accurately reflects its pronunciation.
A lisper is a person who speaks with a pronounced speech impediment known as a lisp. A lisp is characterized by the difficulty in accurately pronouncing certain sounds, particularly those involving "s" and "z". This condition, known as sibilant lisping, usually manifests as a distortion or substitution of these sounds with a hissing or slurred noise.
Typically, a lisper will produce sounds like "th" instead of "s" or "z", resulting in words that may sound unclear or difficult to understand. Although lisping can vary in severity, it often affects the clarity and intelligibility of a person's speech. Lisping can be present in individuals of all ages, ranging from children learning to speak to adults. It can occur as a result of a structural or muscular abnormality in the mouth, jaws, or tongue, or it may be a learned habit or speech pattern.
Lisping may have social and psychological implications, as individuals who lisp might face teasing, ridicule, or self-consciousness about their speech. However, therapy techniques, such as speech exercises and techniques, can be employed to help reduce or eliminate the lisp and improve speech clarity. It is important to note that lisping does not necessarily indicate a lack of intelligence or competency; it is simply a speech characteristic that can be addressed with appropriate techniques and support.
One who lisps.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
The word "lisper" is derived from the verb "to lisp", which originated in the late 16th century. "Lisp" comes from the Middle English word "lispen", which in turn finds its roots in the Old English word "wlyspian" or "wlispian". This Old English term is thought to be an onomatopoeic creation, imitating the sound produced by someone with a lisp. The term "lisper" refers to a person who has a speech impediment characterized by pronouncing "s" and "z" sounds as "th" or producing other articulation errors.
