lambdacism vs defect of speech

lambdacism and defect of speech both are nouns.

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

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

lambdacism: speech defect involving excessive use or unusual pronunciation of the phoneme `l'
defect of speech: a disorder of oral speech

Other hypernyms of lambdacism include speech defect, speech disorder.

lambdacism (noun)	defect of speech (noun)
speech defect involving excessive use or unusual pronunciation of the phoneme `l'	a disorder of oral speech