glottis vs speech organ

glottis and speech organ both are nouns.

Word	Noun	Adjective	Verb	Adverb
glottis	Yes	No	No	No
speech organ	Yes	No	No	No

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

glottis: the vocal apparatus of the larynx; the true vocal folds and the space between them where the voice tone is generated
speech organ: any of the organs involved in speech production

Other hypernyms of glottis include organ of speech, vocal organ.

glottis (noun)	speech organ (noun)
the vocal apparatus of the larynx; the true vocal folds and the space between them where the voice tone is generated	any of the organs involved in speech production