organ of speech vs speech organ

organ of speech and speech organ both are nouns.

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

As nouns, organ of speech and speech organ are synonyms defined as:

organ of speech and speech organ: any of the organs involved in speech production

Other synonyms of organ of speech include vocal organ.

organ of speech (noun)	speech organ (noun)
any of the organs involved in speech production	any of the organs involved in speech production