We don't have synonyms for allodial yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are allodia, alodial and allodian.
(adj) :
(usually historical) Pertaining to land owned by someone absolutely, without any feudal obligations; held without acknowledgement of any superior; allodial title.
(adj) :
(usually historical) Pertaining to land owned by someone absolutely, without any feudal obligations; held without acknowledgement of any superior; allodial title.