Subsonic is a 8 letter English word. It's valid Scrabble word worth 12 points. It's valid Words with friends word worth 16 points.
You can make 192 anagrams from letters in subsonic (bcinossu).
1940-45; sub- + -sonic
Most of their conversation is carried on in tones of subsonic frequency, so your ears cannot hear it.
And its booming notes descended to subsonic throbbings that gripped and wrung the nerves to anguish.
12
16