Munchausen syndrome vs Munchausen's syndrome

Munchausen syndrome and Munchausen's syndrome both are nouns.

Word	Noun	Adjective	Verb	Adverb
Munchausen syndrome	Yes	No	No	No
Munchausen's syndrome	Yes	No	No	No

As nouns, Munchausen syndrome and Munchausen's syndrome are synonyms defined as:

Munchausen syndrome and Munchausen's syndrome: syndrome consisting of feigning acute and dramatic illness for which no clinical evidence is ever found

Munchausen syndrome (noun)	Munchausen's syndrome (noun)
syndrome consisting of feigning acute and dramatic illness for which no clinical evidence is ever found	syndrome consisting of feigning acute and dramatic illness for which no clinical evidence is ever found