| Answer | Crossword Clue |
|---|---|
| ARF | Less threatening sound than "grr" |
| subsonic | moving at a speed less than that of sound |
| subsonically | SUBSONIC, moving at a speed less than that of sound |
| subsonic | noting or pertaining to a speed less than that of sound in air at the same height above sea level |
| sonorant | voiced sound that is less sonorous than a vowel but more sonorous than a stop or fricative and that may occur as either a sonant or a consonant, as (l, r, m, n, y, w) |
