third tonsil vs Luschka's tonsil

third tonsil and Luschka's tonsil both are nouns.

Word	Noun	Adjective	Verb	Adverb
third tonsil	Yes	No	No	No
Luschka's tonsil	Yes	No	No	No

As nouns, third tonsil and Luschka's tonsil are synonyms defined as:

third tonsil and Luschka's 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, pharyngeal tonsil, tonsilla adenoidea, tonsilla pharyngealis.

third tonsil (noun)	Luschka's 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)