speech disorder vs speech defect

speech disorder and speech defect both are nouns.

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

As nouns, speech disorder and speech defect are synonyms defined as:

Other synonyms of speech disorder include defect of speech.

speech disorder (noun)	speech defect (noun)
a disorder of oral speech	a disorder of oral speech