small stones
礫 centers on small stones, especially pebbles or gravel. The meaning is concrete and narrow, without broad abstract extensions.
礫 combines 石 (stone) with 樂, which likely contributes the sound レキ. The character specifically denotes small stones or pebbles.
The left side is 石 (stone), and the right side 樂 looks like a pile of small objects. Picture a heap of tiny stones: 礫 means small stones or pebbles.
For レキ, imagine a pile of small stones making a rattling sound like 'reki-reki' when shaken. The sound 'reki' cues レキ.
rubble; debris; wreckage; tiles and pebbles
stone (used for throwing)
pebbles
rock flying out of nowhere (while in the mountains)
boulder
not getting a reply
lapilli
pellet; pebble; small rock
small stone; gravel
chopping tool; chopping stoneware
gravelly soil
conglomerate stone
chopping tool; chopping stoneware
paper pellet; spitball
breccia
aimless attempt; crapshoot; shot in the dark