gowl

Then, uttering one deep, cavernous “gowl” it came straight for them.

A single “gowl” came from his throat, as he was flung back off the sharp horns of the antelope.

Ere he had reached the corner, a gowl of anger and grief struck his ear, and he wheeled eagerly.

At this the heart within me gave way, and I roared out in my helpless pain a perfect "gowl" of anger and grief.