under attack vs vulnerable

under attack and vulnerable both are adjectives.

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

under attack (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