KanjiJLPT N1
Erupt

erupt, spout, emit, flush out

Mnemonic

A mountain erupts from its gaping mouth, hurling cross-shaped lava chunks that ignite the grass below. Farmers watch their money burn as every field turns to ash. The mouth keeps spewing, each cross of flame torching more grass, costing more money than anyone can imagine.
Additional thoughts
Picture the mouth of a volcano launching cross-shaped fireballs that rain onto grassy farmland — the financial devastation (money) drives the emotional punch. Stack the radicals vertically in your mind: mouth at the base, cross and grass in the middle, money fueling the destruction.
Quick recall
A volcano's mouth Erupts cross-shaped fireballs onto grasslands, destroying all the farmers' money.

Details

The keyword for 噴 is erupt. This kanji refers to the forceful expulsion or bursting forth of something, such as lava from a volcano, water from a geyser, or steam from a vent. It conveys the idea of matter being violently projected outward under pressure. The character captures both natural phenomena like volcanic eruptions and more everyday occurrences like spraying or spouting.
On'yomi
ふん
Kun'yomi
ふ.く