wildcatter

/W AY1 L D K AE0 T ER0/
noun
  1. 1

    Someone who drills for oil speculatively.

  2. 2

    A worker who participates in a wildcat strike.

  3. 3

    A person who makes wildcat cartridges and the guns that use them.

Source: https://en.wiktionary.org/wiki/wildcatter