The suffix <i>tria</i> was one of the original ones I posted. I made a mistake as it seems to be feminine (unless all the terrorists are women).

There's a verb <i>deimatoo:</i> and a couple of compounds <i>deima:to:de:s</i> 'terrible, frightful' and <i>deima:to:sis</i> 'scaring'.

I guess <i>deimatotrophobia</i>, using <i>tro</i> instead of <i>tria</i> for the nomen agentis suffix.

Sorry about that ...