According to SOWPODS (the combination of Scrabble dictionaries
used around the world) there are 12 words with the pattern
---R-GI--. That is, nine letter words with 4th letter R and 6th
letter G and 7th letter I. In alphabetical order, they are:
aborigine
aborigins
averaging
barraging
bioregion
ecoregion
outraging
pierogies
pterygial
pterygium
subregion
umbraging