The Collaborative International Dictionary of English v.0.48:

Philosophizer \Phi*los"o*phi`zer\
   (f[i^]*l[o^]s"[-o]*f[imac]`z[~e]r), n.
   One who philosophizes.
   [1913 Webster]

WordNet (r) 3.0 (2006):

philosophizer
    n 1: someone who considers situations from a philosophical point
         of view [syn: philosophizer, philosophiser]