According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 16 words with the pattern M-R-A-I--. That is, nine letter words with 1st letter M and 3rd letter R and 5th letter A and 7th letter I. In alphabetical order, they are:
marcasite
margarine
margarins
margarita
margarite
marialite
marmalise
marmalize
marmarise
marmarize
mordacity
morganite
mortalise
mortality
mortalize
mortaring