critical vs severe

critical and severe both are adjectives.

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

critical (adjective)	severe (adjective)
marked by a tendency to find and call attention to errors and flaws	causing fear or anxiety by threatening great harm
characterized by careful evaluation and judgment	intensely or extremely bad or unpleasant in degree or quality
being in or verging on a state of crisis or emergency	severely simple
at or of a point at which a property or phenomenon suffers an abrupt change especially having enough mass to sustain a chain reaction	very strong or vigorous
of or involving or characteristic of critics or criticism	very bad in degree or extent
forming or having the nature of a turning point or crisis	unsparing and uncompromising in discipline or judgment
urgently needed; absolutely necessary