third tonsil vs pharyngeal tonsil

third tonsil and pharyngeal tonsil both are nouns.

Word	Noun	Adjective	Verb	Adverb
third tonsil	Yes	No	No	No
pharyngeal tonsil	Yes	No	No	No

As nouns, third tonsil and pharyngeal tonsil are synonyms defined as:

third tonsil and pharyngeal tonsil: a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx)

Other synonyms of third tonsil include adenoid, Luschka's tonsil, tonsilla adenoidea, tonsilla pharyngealis.

third tonsil (noun)	pharyngeal tonsil (noun)
a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx)	a collection of lymphatic tissue in the throat behind the uvula (on the posterior wall and roof of the nasopharynx)