eruption vs volcano

eruption and volcano both are nouns.

Word	Noun	Adjective	Verb	Adverb
eruption	Yes	No	No	No
volcano	Yes	No	No	No

eruption (noun)	volcano (noun)
the sudden occurrence of a violent discharge of steam and volcanic material	a mountain formed by volcanic material
a sudden very loud noise	a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
the emergence of a tooth as it breaks through the gum
a sudden violent spontaneous occurrence (usually of some undesirable condition)
(of volcanoes) pouring out fumes or lava (or a deposit so formed)
symptom consisting of a breaking out and becoming visible