Combustible can be used as an adjective and a noun.
Adjective: Gas vapors are combustible.
Noun: Don't store combustibles in the house.
Alcohol is both flammable and combustible.
No, ammonia is not a combustible gas. It is a highly reactive gas that can contribute to combustion if in the presence of other combustible materials, but it is not considered combustible on its own.
Noun.
Example sentence - The combustible materials made the fire burn hotter.
Combustible means capable of catching fire and burning easily. Substances that are combustible can ignite and sustain combustion in the presence of oxygen.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.
The part of speech for "lecturer" is a noun.
The part of speech for "breezy" is an adjective.