Tetraphobia is the phobia of monsters in the dark. It is mostly
to young children in their bedroom.
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Yes there is, like: Arithmophobia - numbers in general
Hexakosioihexekontahexaphobia - 666 Tetraphobia - 4 Terdekaphobia
or Triskadekaphobia- 13
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Numerophobia is the fear of numbers. Another name for the condition is Arithmophobia.
Specifically, fear of the number 13 is Triskaidekaphobia,fear of the number 666 is Hexakosioihexekontahexaphobia, and fear of the number 4 is Tetraphobia.
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There is no specific phobia that is a fear of curse words.
Offenceaphobia is the fear of offending people, and that includes
the fear of using curse words. The general fear of words is called
logophobia.