Synonyms for Onrush:

• n.

  •
  • start,
  • flutter,
  • jerk,
  • dart,
  • lunge,
  • assault,
  • dive,
  • jump,
  • twitch,
  • flick.
  •
  • offense,
  • offensive,
  • strike,
  • aggression.
  •attack (noun)
  • dirty deed,
  • incursion,
  • volley,
  • muggings,
  • onslaught,
  • encounter,
  • initiative.
  •event (noun)
  • onrush.
  •onset (noun)
  • Outstart,
  • onfall.
  •rush (noun)
  • flux,
  • hurriedness,
  • scramble,
  • deluge,
  • flow,
  • avalanche,
  • hastiness,
  • dash,
  • stream,
  • race,
  • haste,
  • push,
  • swiftness,
  • hurry,
  • flood,
  • stampede,
  • blitz,
  • charge,
  • storm.

• Other synonyms:

  •
  • Assailment.

Antonyms for Onrush:

• n.

  • rush
    defense, rest, delay, slowness, retreat.
  • Other antonyms:
    recession, regression, about-face, retraction, recess, return, reverse, turnabout, retrogression, reflux, reversal, backwash, ebb, regress, turnaround.

Hyponym for Onrush:

• n.

  • event
    spate, surge, upsurge, rush.