attack vs assail

attack is a noun but assail is not a noun.

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

As verbs, attack and assail are synonyms defined as:

Other synonyms of attack include assault, lash out, round, snipe.

As verbs, attack and assail are synonyms defined as:

attack and assail: launch an attack or assault on; begin hostilities or start warfare with

As verbs, attack and assail are synonyms defined as:

Other synonyms of attack include assault, set on.

attack (noun)	assail (noun)
(military) an offensive against an enemy (using weapons)
a decisive manner of beginning a musical tone or phrase
the act of attacking
ideas or actions intended to deal with a problem or situation
an offensive move in a sport or game
strong criticism
intense adverse criticism
the onset of a corrosive or destructive process (as by a chemical agent)
a sudden occurrence of an uncontrollable condition

attack (verb)	assail (verb)
begin to injure	attack in speech or writing
set to work upon; turn one's energies vigorously to a task	attack someone physically or emotionally
attack in speech or writing	launch an attack or assault on; begin hostilities or start warfare with
launch an attack or assault on; begin hostilities or start warfare with
take the initiative and go on the offensive
attack someone physically or emotionally