I am for peace
shalowm (shaw-lome')
safe, i.e. (figuratively) well, happy, friendly; also (abstractly) welfare, i.e. health, prosperity, peace
but when I speak
dabar (daw-bar')
perhaps properly, to arrange; but used figuratively (of words), to speak; rarely (in a destructive sense) to subdue
they are for war
milchamah (mil-khaw-maw')
a battle (i.e. the engagement); generally, war (i.e. warfare) -- battle, fight(-ing), war(-rior).