Persian Suffix گاه (-gâh) attaches to all forms of words including nouns, adjectives and stems. This suffix mainly means "place of" but in certain derivations it means "time of" (a particular point in time). گاه is a very productive suffix.
| Word | Derivation |
|---|---|
| ایست ist stop | ایستگاه istgâh stop, station |
| فروش forush selling, sale | فروشگاه forushgâh department store |
| درمان darmân cure | درمانگاه darmângâh clinic |
| خواب khwâb sleep | خوابگاه khwâbgâh dormitory |
| آزمایش âzmâyesh test, examination | آزمایشگاه âzmâyeshgâh laboratory |
| پالایش pâlâyesh refining | پالایشگاه pâlâyeshgâh refinery |
| آرایش ârâyesh make-up | آرایشگاه ârâyeshgâh hairdresser's, barber’s |
| کار kâr work | کارگاه kârgâh workshop |
| پژوهش pazhuhesh research | پژوهشگاه pazhuheshgâh research house/institute |