gas vs gassing

gas and gassing both are nouns.

Word	Noun	Adjective	Verb	Adverb
gas	Yes	No	Yes	No
gassing	Yes	No	No	No

gas (noun)	gassing (noun)
a pedal that controls the throttle valve	the deliberate act of poisoning some person or animal with gas
the state of matter distinguished from the solid and liquid states by: relatively low density and viscosity; relatively great expansion and contraction with changes in pressure and temperature; the ability to diffuse readily; and the spontaneous tendency to become distributed uniformly throughout any container	the process of interacting with gas
a state of excessive gas in the alimentary canal
a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines
a fossil fuel in the gaseous state; used for cooking and heating homes

gas (verb)	gassing (verb)
show off
attack with gas; subject to gas fumes