geyser vs overrun

geyser and overrun both are nouns.

Word	Noun	Adjective	Verb	Adverb
geyser	Yes	No	Yes	No
overrun	Yes	No	Yes	No

As verbs, overrun is a hypernym of geyser; that is, overrun is a word with a broader meaning than geyser:

Other hypernyms of geyser include brim over, overflow, run over, well over.

geyser (noun)	overrun (noun)
a spring that discharges hot water and steam	too much production or more than expected

geyser (verb)	overrun (verb)
to overflow like a geyser	run beyond or past
	seize the position of and defeat
	flow or run over (a limit or brim)
	invade in great numbers
	occupy in large numbers or live on a host