gasometer vs gas holder

gasometer and gas holder both are nouns.

Word	Noun	Adjective	Verb	Adverb
gasometer	Yes	No	No	No
gas holder	Yes	No	No	No

As nouns, gasometer and gas holder are synonyms defined as:

gasometer and gas holder: a large gas-tight spherical or cylindrical tank for holding gas to be used as fuel

gasometer (noun)	gas holder (noun)
a large gas-tight spherical or cylindrical tank for holding gas to be used as fuel	a large gas-tight spherical or cylindrical tank for holding gas to be used as fuel
a meter for measuring the amount of gas flowing through a particular pipe