According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 10 words with the pattern ---RT--I-. That is, nine letter words with 4th letter R and 5th letter T and 8th letter I. In alphabetical order, they are:
anarthria
anarthric
apartheid
courtship
heartikin
overtimid
overtrain
shirttail
shorthair
sparterie