action vs extravasation

action and extravasation both are nouns.

Word	Noun	Adjective	Verb	Adverb
action	Yes	No	Yes	No
extravasation	Yes	No	No	No

As nouns, extravasation is a hyponym of action; that is, extravasation is a word with a more specific, narrower meaning than action:

action: the state of being active
extravasation: (of volcanoes) pouring out fumes or lava (or a deposit so formed)

Other hyponyms of action include agency, busyness, hum, behavior, behaviour, eructation, eruption, operation, overdrive, play, swing.

action (noun)	extravasation (noun)
the most important or interesting work or activity in a specific area or field	the process of exuding or passing out of a vessel into surrounding tissues; said of blood or lymph or urine
a judicial proceeding brought by one party against another; one party prosecutes another for a wrong done or for protection of a right or for prevention of a wrong	(of volcanoes) pouring out fumes or lava (or a deposit so formed)
something done (usually as opposed to something said)	an extravasated liquid (blood or lymph or urine); the product of extravasation
a military engagement
an act by a government body or supranational organization
the operating part that transmits power to a mechanism
In firearms terminology, the mechanism that handles the ammunition (loads, locks, fires, and extracts the cartridges).
the trait of being active and energetic and forceful
the series of events that form a plot
a process existing in or produced by nature (rather than by the intent of human beings)
the state of being active

action (verb)	extravasation (verb)
put in effect
institute legal proceedings against; file a suit against