We don't have synonyms for necessarium yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are necessarily, necessaries and necessarian.
(n) :
(humorous, sometimes capitalized or with the definite article) A lavatory.
(n) :
(architecture) Synonym of reredorter: a monastery's latrine, outhouse, or lavatory, typically located behind the dormitory.
(n) :
Alternative form of necessarium. [(architecture) Synonym of reredorter: a monastery's latrine, outhouse, or lavatory, typically located behind the dormitory.]
(n) :
(humorous, sometimes capitalized or with the definite article) A lavatory.
(n) :
(architecture) Synonym of reredorter: a monastery's latrine, outhouse, or lavatory, typically located behind the dormitory.
(n) :
Alternative form of necessarium. [(architecture) Synonym of reredorter: a monastery's latrine, outhouse, or lavatory, typically located behind the dormitory.]