under fire vs vulnerable

under fire and vulnerable both are adjectives.

Word	Noun	Adjective	Verb	Adverb
under fire	No	Yes	No	No
vulnerable	No	Yes	No	No

under fire (adjective)	vulnerable (adjective)
subjected to enemy attack or censure	susceptible to attack
	susceptible to criticism or persuasion or temptation
	capable of being wounded or hurt