assail vs surround

assail is not a noun while surround is a noun.

Word	Noun	Adjective	Verb	Adverb
assail	No	No	Yes	No
surround	Yes	No	Yes	No

As verbs, surround is a hyponym of assail; that is, surround is a word with a more specific, narrower meaning than assail:

assail: launch an attack or assault on; begin hostilities or start warfare with
surround: surround so as to force to give up

assail (noun)	surround (noun)
	the area in which something exists or lives

assail (verb)	surround (verb)
attack in speech or writing	surround so as to force to give up
attack someone physically or emotionally	surround with a wall in order to fortify
launch an attack or assault on; begin hostilities or start warfare with	extend on all sides of simultaneously; encircle
	envelop completely