This is the 9770th most frequent Japanese word.
蛍
Firefly.
蛍 refers to the fireflies, indicating a plural context here, commonly found as a natural phenomenon in summer.
夏の夜、川辺に蛍が飛び交っている。
In the summer night, fireflies are flying around by the river.
蛍火 describes the light emitted by the firefly, emphasizing its temporal nature and poetic imagery.
蛍火は一瞬で消える儚い光だ。
A firefly's light is a fleeting and ephemeral glow.
蛍 here symbolizes firefly in a cultural and metaphorical context, representing nature's beauty.