eruption vs emergence

eruption and emergence both are nouns.

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

As nouns, emergence is a hypernym of eruption; that is, emergence is a word with a broader meaning than eruption:

Other hypernyms of eruption include egress, issue.

eruption (noun)	emergence (noun)
the sudden occurrence of a violent discharge of steam and volcanic material	the act of coming (or going) out; becoming apparent
a sudden very loud noise	the act of emerging
the emergence of a tooth as it breaks through the gum	the becoming visible
a sudden violent spontaneous occurrence (usually of some undesirable condition)	the gradual beginning or coming forth
(of volcanoes) pouring out fumes or lava (or a deposit so formed)
symptom consisting of a breaking out and becoming visible