Part of speech: Noun
the sound made by a lion
Categories: Cry
Part of speech: Verb
make a loud noise, as of wind, water, or vehicles
Example: The wind was howling in the trees; The water roared down the chute
Categories: Make noise, Resound, Noise
Part of speech: Verb
act or proceed in a riotous, turbulent, or disorderly way
Example: desperadoes from the hills regularly roared in to take over the town"-R.A.Billington
Categories: Proceed, Go forward, Continue
Part of speech: Verb
laugh unrestrainedly and heartily
Categories: Laugh, Express joy, Express mirth
Hollering, Hollo, Holler, Holloa, Yawl
The word "roar" comes from Proto-Indo-European *rey-. It started in Proto-Germanic *rairāną. Then it appeared in Old English rārian. Later, people used it in Middle English roren.
Each language in this chain added phonetic changes that transformed the original sound.