indispensable vs critical

indispensable and critical both are adjectives.

Word	Noun	Adjective	Verb	Adverb
indispensable	No	Yes	No	No
critical	No	Yes	No	No

indispensable (adjective)	critical (adjective)
not to be dispensed with; essential	marked by a tendency to find and call attention to errors and flaws
absolutely necessary; vitally necessary	characterized by careful evaluation and judgment
unavoidable	being in or verging on a state of crisis or emergency
	at or of a point at which a property or phenomenon suffers an abrupt change especially having enough mass to sustain a chain reaction
	of or involving or characteristic of critics or criticism
	forming or having the nature of a turning point or crisis
	urgently needed; absolutely necessary