twinkle, scintillation, sparkling -- (a rapid change in brightness; a brief spark or flash)
sparkle, twinkle, spark, light -- (merriment expressed by a brightness or gleam or animation of countenance; "he had a sparkle in his eye"; "there's a perpetual twinkle in his eyes")
Overview of verb twinkle
The verb twinkle has 2 senses
flash, blink, wink, twinkle, winkle -- (gleam or glow intermittently; "The lights were flashing")
twinkle, winkle, scintillate -- (emit or reflect light in a flickering manner; "Does a constellation twinkle more brightly than a single star?")