Yeah most likely a wheel bearing and if it is that loud you need to repair before driving the car any more.
Good news its an easy fix if it is wheel bearing but you will need a 36mm socket and you will need to generate 258 ft/lbs of force to torque the fastener properly.
Last time I did it:
-hub bearing assembly: $75
-hub bearing retainer nut: $13 (not re-useable get a new one)
-dust cap: $7
Good luck take your time this is an easy one. Check your tire if it is howling that loud your tire probably is ruined also from cupping or uneven wear.
No need to align after performing the repair.
To determine for sure if it is wheel bearing lift the car and check the bearing for play, there should be ZERO play.