flicker
noun.
a momentary flash of light
Synonym: glint, spark
noun.
North American woodpecker
noun.
the act of moving back and forth
Synonym: flutter, waver
verb.
move back and forth very rapidly
the candle flickered
verb.
shine unsteadily
The candle flickered
Synonym: flick
verb.
flash intermittently
The lights flicked on and off
Synonym: flick