The fear, or phobia, of thunder is called ceraunophobia.

Ceraunophobia is the fear of thunder.

Astraphobia, Astrapophobia, Brontophobia or Keraunophobia is the fear of thunder and lightning.

Kainolophobia or Kainophobia- Fear of anything new, novelty.

Kakorrhaphiophobia- Fear of failure or defeat.

Katagelophobia- Fear of ridicule.

Kathisophobia- Fear of sitting down.

Kenophobia- Fear of voids or empty spaces.

Keraunophobia or Ceraunophobia- Fear of thunder and lightning.(Astraphobia, Astrapophobia)

Kinetophobia or Kinesophobia- Fear of movement or motion.

Kleptophobia- Fear of stealing.

Koinoniphobia- Fear of rooms.

Kolpophobia- Fear of genitals, particularly female.

Kopophobia- Fear of fatigue.

Koniophobia- Fear of dust. (Amathophobia)

Kosmikophobia- Fear of cosmic phenomenon.

Kymophobia- Fear of waves. (Cymophobia)

Kynophobia- Fear of rabies.

Kyphophobia- Fear of stooping.

Hope I helped.

Most sources cite 3 or 4 possible answers, however, almost all sources claim these to be the fear of 'thunder and lightning'

Astraphobia

Brontophobia

Ceraunophobia

Keraunophobia

The most likely way these are broken down, are with Brontophobia being the fear of thunder bronto is the latin prefix for thunder, Cerauno/Kerauno-phobia being the fear of thunder AND lightning - since Cerauno/Kerauno are used as latin words for thunder *and* lightning (or either, but it can be both). This leaves Astraphobia as the specific fear of lightning alone.

However, the 3-4 words are used interchangably for fear of thunder and/or lightning, so you'll probably find you'd need to specifically state which you mean, no matter which of the words you use.

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