guiar
guide
guide
to lead or direct
+
-ar
verb suffix
Guiar means to guide and can be thought of as guide0 + -ar1, where -ar1 indicates it's an infinitive verb1.
verb
  1. guide
    To guide, lead, or direct
    El guía turístico nos va a guiar por la ciudad. // The tour guide is going to guide us through the city.