Merriam-Webster's Collegiate Dictionary:
gas log
gas mask
gas oil
gas plant
gas ring
gas station
gas turbine
gas-guzzler
gas-guzzling
gas-liquid chromatographic
gas-liquid chromatography
gas-operated
gasbag
gascogne
gascoigne
gascon
gasconade
gasconader
gascony
gaseous
gaseousness
gash
gasherbrum
gasholder
gashouse
gasification
gasifier
gasify
gaskell
gasket
gaskin
gaslight
gaslit
gasogene
gasohol
gasolene
gasolier
gasoline
gasolinic
gasometer
gasp
gasp? peninsula
gasper
gaspesian
gassed
gasser
gassily
gassiness
gassy
gast
gasteiz
gaster
gastight
gastightness
gastineau channel
gastness
gastonia
gastr-
gastrectomy
gastri-
gastric
gastric gland
gastric juice
gastric ulcer
gastrin
gastritis
gastro-
gastrocnemius
gastroduodenal
gastroenteritis
gastroenterological
gastroenterologist
gastroenterology
gastroesophageal
gastroesophageal reflux
gastrointestinal
gastrolith
gastronome
gastronomic
gastronomical
gastronomically
gastronomist
gastronomy
gastropod
gastroscope
gastroscopic
gastroscopist
gastroscopy
gastrotrich
gastrovascular
gastrula
gastrular
gastrulate
gastrulation
gasworks
gat
gate
