Answer:
Substitution and omission
Step-by-step explanation:
Substitution error: The term substitution error is defined as the speech sound error in which an individual's sound related to a specific word is replicated to that of another word's sound.
Example: The letter r is being replaced with the letter w, producing a sound of the word rabbit as wabbit.
Omission error: The term omission error is defined as a type of speech sound error in which an individual's sound related to a specific word is being omitted.
Example: Lisp sounds.