lallation vs speech disorder

lallation and speech disorder both are nouns.

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

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

lallation: defective articulation of the `l' phoneme or the phoneme `r' is pronounced as `l'
speech disorder: a disorder of oral speech

Other hypernyms of lallation include defect of speech, speech defect.

lallation (noun)	speech disorder (noun)
gibberish resembling the sounds of a baby	a disorder of oral speech
defective articulation of the `l' phoneme or the phoneme `r' is pronounced as `l'