攻撃【こうげき】
attack, assault, raid, onslaught, offensive, criticism, censure, denunciation, condemnation
専攻【せんこう】
major subject, special study
攻勢【こうせい】
offensive (movement), aggression
攻防【こうぼう】
offense and defense, offence and defence
攻める【せめる】
to attack, to assault, to assail
攻守【こうしゅ】
offense and defense, offence and defence, batting and fielding