Did you mayhaps mean photophobia?
“Nobody's sure what triggers brontophobia (the fear of thunderstorms).”
These user-created lists contain the word ‘brontophobia’.
List of words from phrontistery.info
"Luciferous Logolepsy is a collection of over 9,000 obscure English words. Though the definition of an 'English' word might seem to be straightforward, it is not. There exist so many adopted, deriv...
All the words from the Grandiloquent Dictionary.
946 of these 2700 words do not yield any results in six different dictionaries, hence many of them might be misspellings.
A selection of words appearing in Mrs Byrne's dictionary of unusual, obscure, and preposterous words (1994 edition).
Looking for tweets for brontophobia.