different between dysgraphia vs agraphia

English

dys- +? graphia, from Ancient Greek ???- (dus-, “hard”) and ????? (gráph?, “I write”).

dysgraphia (countable and uncountable, plural dysgraphias)

A language disorder that affects a person's ability to write.
- 2007 — Sharon Vaughn, Candace S. Bos, & Jeanne Shay Schumm, Teaching Students who are Exceptional, Diverse, and At Risk in the General Education Classroom, page 390
  Students with dysgraphia have severe problems learning to write.

a- +? graphia, from Ancient Greek ?- (a-) and ????? (gráph?, “I write”).

agraphia (usually uncountable, plural agraphias)

(pathology) A loss of the ability to write (usually resulting from a brain injury).
The inability to write.

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