WordNet sense 1 (intense adverse criticism):

blast, fire, flack, flak

WordNet sense 2 (attack someone physically or emotionally):

assail, assault

WordNet sense 3 (take the initiative and go on the offensive):

aggress

WordNet sense 4 ((military) an offensive against an enemy (using weapons)):

onrush, onset, onslaught

WordNet sense 5 (ideas or actions intended to deal with a problem or situation):

approach, plan of attack

WordNet sense 6 (attack in speech or writing):

round, snipe, lash out

WordNet sense 7 (the act of attacking):

attempt

WordNet sense 8 (a decisive manner of beginning a musical tone or phrase):

tone-beginning