Crossword Puzzle Making sounds

Clue: Making sounds

One making dove sounds (COOER with 5 letters)
Making short percussive sounds (RATTLING with 8 letters)
Not making any sounds (ASQUIETASAMOUSE with 15 letters)
Making the most haughty sounds (SNORTIEST with 9 letters)
Making low sounds? (MOOING with 6 letters)
Making pasture sounds (MOOING with 6 letters)
Soft sounds (e.g. MURMURS with 7 letters)
Grp. making barrels of money? (OPEC with 4 letters)
Branch of mathematics that sounds like what a grown-up acorn would say (GEOMETRY with 8 letters)
Carrier making short hops (AIRTAXI with 7 letters)