A speech defect is a condition in which an individual has difficulty producing speech sounds correctly or fluently. The three crossword solutions for the term speech defect are lisp, STAMMER, and STUTTER. A lisp is a speech disorder in which an individual has difficulty pronouncing the letter 's' or 'z'. A STAMMER is a speech disorder in which an individual has difficulty speaking due to involuntary repetitions and prolongations of sounds, syllables, or words. Lastly, a STUTTER is a speech disorder in which an individual has difficulty speaking due to involuntary repetitions and pauses in speech.