lambdacism vs speech defect

lambdacism and speech defect both are nouns.

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

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

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

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

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