We don't have synonyms for monazites yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are monazite, moabites and monamines.
(n) :
(mineralogy) any of a range of reddish-brown minerals that are mixed phosphates of the lighter rare earth elements lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium and yttrium
(n) :
(mineralogy) any of a range of reddish-brown minerals that are mixed phosphates of the lighter rare earth elements lanthanum, cerium, praseodymium, neodymium, samarium, europium, gadolinium and yttrium