adult tooth vs permanent tooth

adult tooth and permanent tooth both are nouns.

Word	Noun	Adjective	Verb	Adverb
adult tooth	Yes	No	No	No
permanent tooth	Yes	No	No	No

As nouns, adult tooth and permanent tooth are synonyms defined as:

adult tooth and permanent tooth: any of the 32 teeth that replace the deciduous teeth of early childhood and (with luck) can last until old age

adult tooth (noun)	permanent tooth (noun)
any of the 32 teeth that replace the deciduous teeth of early childhood and (with luck) can last until old age	any of the 32 teeth that replace the deciduous teeth of early childhood and (with luck) can last until old age