lallation vs defect of speech

lallation and defect of speech both are nouns.

Word	Noun	Adjective	Verb	Adverb
lallation	Yes	No	No	No
defect of speech	Yes	No	No	No

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

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

Other hypernyms of lallation include speech defect, speech disorder.

lallation (noun)	defect of speech (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'