small bell, buzzer
鈴 centers on a small ringing device: a small bell or buzzer that produces a clear, light sound.
鈴 combines 金 (metal) with 令, which likely contributes the sound and may relate to the idea of a clear, commanding ring.
The left side 金 means metal, and the right side 令 looks like a person under a roof, as if a metal bell is ringing to summon people inside.
For レイ, imagine a small bell ringing out a clear 'lay' sound: lay -> レイ, and the metal bell chimes.
bell (often globular)
wind chime; wind bell
lily of the valley (Convallaria keiskei)
bell cricket (Meloimorpha japonica)
bell (used for summoning or signalling); buzzer
potato (Solanum tuberosum)
bell signalling that work, class, etc. will formally begin shortly; first bell; warning bell
dumbbell
Futabasaurus suzukii (species of plesiosaur)
earthenware (ceramic) bell
large bell (at a shrine)
hand bell; ringing of a bell
bell signalling that work, class, etc. has formally begun
bear bell
auditory guidance signal (for the visually impaired); guiding chime; auditory guidance device
Epipactis papillosa (species of orchid)
auditory guidance signal (for the visually impaired); guiding chime; auditory guidance device
vajra bell
bunches (e.g. of fruit); clusters
to grow in clusters