We don't have synonyms for montem yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are monte, montez and monter.
(n) :
(UK, historical) A former custom of Eton schoolboys to go to a hill on the Bath road every third Whit Tuesday to demand 'salt-money' from passers-by, for the university expenses of the senior scholar or school captain.
(n) :
(UK, historical) A former custom of Eton schoolboys to go to a hill on the Bath road every third Whit Tuesday to demand 'salt-money' from passers-by, for the university expenses of the senior scholar or school captain.