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.

WordDerivation
ایست
ist
stop
ایستگاه
istgâh
stop, station
فروش
foruš
selling, sale
فروشگاه
forušgâh
department store
درمان
darmân
cure
درمانگاه
darmângâh
clinic
خواب
xwâb
sleep
خوابگاه
xwâbgâh
dormitory
آزمایش
âzmâyeš
test, examination
آزمایشگاه
âzmâyešgâh
laboratory
پالایش
pâlâyeš
refining
پالایشگاه
pâlâyešgâh
refinery
آرایش
ârâyeš
make-up
آرایشگاه
ârâyešgâh
hairdresser's, barber’s
کار
kâr
work
کارگاه
kârgâh
workshop
پژوهش
pažuheš
research
پژوهشگاه
pažuhešgâh
research house/institute