nasal vs adenoidal

nasal is a noun but adenoidal is not a noun.

Word	Noun	Adjective	Verb	Adverb
nasal	Yes	Yes	No	No
adenoidal	No	Yes	No	No

As adjectives, nasal and adenoidal are synonyms defined as:

Other synonyms of nasal include pinched.

nasal (noun)	adenoidal (noun)
an elongated rectangular bone that forms the bridge of the nose
a consonant produced through the nose with the mouth closed

nasal (adjective)	adenoidal (adjective)
of or in or relating to the nose	of or pertaining to the adenoids
sounding as if the nose were pinched	sounding as if the nose were pinched