dysnomia

noun3

1. •
   Anomic aphasia, a condition affecting the memory that impairs the recall of words or names.
2. •
   Impaired or deficient ability to recall words or names.

   • Dysnomia refers to a large group of children who talk and understand well but have difficulty with word retrieval.[…]Dysnomia is a well-established antecedent to stuttering or stammering. — 1989
3. •
   An incident of a person not recalling a word or name.