anarthria vs speech defect

anarthria and speech defect both are nouns.

Word	Noun	Adjective	Verb	Adverb
anarthria	Yes	No	No	No
speech defect	Yes	No	No	No

As nouns, speech defect is a hypernym of anarthria; that is, speech defect is a word with a broader meaning than anarthria:

anarthria: partial or total loss of articulate speech resulting from lesions of the central nervous system
speech defect: a disorder of oral speech

Other hypernyms of anarthria include defect of speech, speech disorder.

anarthria (noun)	speech defect (noun)
partial or total loss of articulate speech resulting from lesions of the central nervous system	a disorder of oral speech