Roar, Roaring - Vine's Expository Dictionary of New Testament Words
Roar, Roaring[ A-1,Verb,G3455, mukaomai ]
properly of oxen, an onomatopeic word, to low, bellow," is used of a lion, Revelation 10:3.
[ A-2,Verb,G5612, oruomai ]
"to howl" or "roar," onomatopoeic, of animals or men, is used of a lion, 1 Peter 5:8, as a simile of Satan.
[ B-1,Noun,G2279, echos ]
"a noise" or "sound" (Eng., "echo"), is used of the "roaring" of the sea in Luke 21:25, in the best mss., "for the roaring (of the sea and the billows)," RV; some mss. have the present participle of echeo, "to sound," AV, "(the sea and the waves) roaring. See RUMOR, SOUND.