-ory
From Longman Dictionary of Contemporary English-ory-ory1 /əri $ ɔːri, əri/ suffix [in nouns] PLACETHINGa place or thing that is used for doing something an observatory (=a place from where people watch something, especially the stars)Examples from the Corpus-ory• a directory-ory-ory2 suffix [in adjectives] DOdescribes something that does a particular thing an explanatory note (=that gives an explanation) a congratulatory telegram (=that congratulates someone)