Not sure if it's a good idea, but maybe try:

  foo-bar # kebab-case
  foo−bar # subtraction
  foo minus bar # subtraction? (infix identifier "minus")
  foo - bar # subtraction (infix identifier "-")
  foo − bar # subtraction (operator symbol)

using \u2212 as a explicit subtraction operator for people who really can't stand having 'extra' whitespace?