A — 1: μυκάομαι
(Strong's #3455 — Verb — mukaomai — moo-kah'-om-ahee )

properly of oxen, an onomatopeic word, "to low, bellow," is used of a lion, Revelation 10:3 .

A — 2: ὠρύομαι
(Strong's #5612 — Verb — oruomai — o-roo'-om-ahee )

"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: ἦχος
(Strong's #2279 — Noun Masculine — echos — ay'-khos )

"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.