Elves and Hob

Elves noun - An acronym for emissions of light and very low frequency perturbations due to electromagnetic pulse sources; extremely bright extremely short (less than a msec) electrical flashes forming a huge ring (up to 400 km diameter) in the ionosphere.

Hob is a synonym for elves. In some cases you can use "Hob" instead a noun "Elves".

Hob noun - Playful, reckless behavior that is not intended to cause serious harm.

Elves is a synonym for hob. Sometimes you can replace term "Elves" with "Hob", this nouns are similar.