Strong's #4671: mots (pronounced motes)
 or mowts (Zephaniah 2:2) {motes}; from 4160; chaff (as pressed out, i.e. winnowed or (rather) threshed loose):--chaff.
Brown-Driver-Briggs Hebrew Lexicon:
 / 
  môts 
 
 1) chaff
 
 1a) always as driven by wind
 
  Part of Speech: noun masculine
Relation: from H4160
Usage:
This word is used 8 times:
Job 21:18: "as stubble before the wind,  and as chaff that the storm carrieth away."
Psalms 1:4: "are not so: but  are like the chaff which the wind driveth away."
Psalms 35:5: "Let them be  as chaff before the wind: and let the angel of the LORD chase"
Isaiah 17:13: "them, and they shall flee far off, and shall be chased  as the chaff of the mountains before the wind,"
Isaiah 29:5: "dust, and the multitude of the terrible ones  shall be as chaff that passeth away: yea, it shall be at an instant suddenly."
Isaiah 41:15: "and beat them small, and shalt make the hills  as chaff."
Hosea 13:3: "and as the early dew that passeth away,  as the chaff that is driven with the whirlwind out of the floor, and as the smoke"
Zephaniah 2:2: "bring forth, before the day pass  as the chaff, before the fierce anger of the LORD"