severe vs critical

severe and critical both are adjectives.

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

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