instantly

now

The present moment

• momentBrief period of time
• flashBrief burst of light
• secondUnit smaller than minute

blink · straightaway · forthwith · directly · promptly · on-the-spot · pronto · immediately · split-second · heartbeat

halt

Complete sudden stop

• stopCease all motion
• freezeBecome solid from cold
• ceaseTo discontinue activity

terminate · interrupt · cut-off · snap · jolt · shock · startle · sudden · discontinue · break

swift

Moving with speed

• fastSpeedy, or skip eating
• quickMoving with speed
• lightningAtmospheric electrical discharge

rapid · speedy · meteoric · whirlwind · breakneck · supersonic · zippy · turbo · express · fleeting

click

Brief sharp noise

• realizeBecome aware of
• recognizePerceive as known
• graspSeize or understand

understand · know · identify · spot · detect · perceive · discern · register · dawn · hit

change

To make different

• convertChange in form or faith
• transformChange completely in form
• shiftMovement or work period

switch · morph · become · turn · transmute · alter · transition · flip

• urgencyurgent, urgently, emergency, ASAP, stat
• Right Awaynow, immediately, promptly, forthwith, straightaway
• suddennesssudden, suddenly, abrupt, abruptly, immediate
• time wordsminute, hour, day, now, soon
• adverbsquickly, slowly, very, really, now
• instantlysuddenly, immediately, at once, abruptly, in a flash