例文（１級）：rumble，esoteric

I can hear the rumble of thunder in the distance, a sound that is both
soothing and thrilling at the same time.
(私は遠くの雷のごろごろという音が聞こえます。その音は心地よく、同時にワクワクするものです。)

Note: Although the word “rumble” can also mean the sound made by a
moving vehicle, I chose to interpret it as the sound of thunder in
this context.

rumble： ごろごろ鳴る
esoteric： 難解な、秘密の、秘伝の