blowing gas vs blow gas

blowing gas and blow gas both are nouns.

Word	Noun	Adjective	Verb	Adverb
blowing gas	Yes	No	No	No
blow gas	Yes	No	No	No

As nouns, blowing gas and blow gas are synonyms defined as:

blowing gas and blow gas: the gas leaving a generator during a blow period

blowing gas (noun)	blow gas (noun)
the gas leaving a generator during a blow period	the gas leaving a generator during a blow period