I would like to know the usage of these words. In English it seems to me that communication disorder is a more technical, clinical term.
But if I try to find the definition of コミュ症, such as on Wiktionary or other places, the definition is very informal:
(informal) having despairingly poor ability to converse with people due to social anxiety.
And at japandict.com
being bad at communication, being unsociable
I've seen this term translated at communication disorder in at least one manga (Komi Can't Communicate) and probably in another (Watamote), but to me it does not seem equivalent to the English word. Communication disorder applies to a broad range of disorders far beyond just social anxiety disorder, and it isn't used so informally as to just mean "bad at communicating".
Thus, I would like to know more about the definition of this word and how it is used in different situations, and whether there are circumstances it would be equivalent to the English "communication disorder".