Special | Define Special at Dictionary.com
In American English the adjective special is overwhelmingly more common than especial in all senses: He will be of special help if you can't understand the documentation. The reverse is true of the adverbs; here especially is by far the more common: He will be of great help, especially if you have trouble understanding the documentation. Only when the sense “specifically” is intended is specially more idiomatic: The machine was specially designed for use by a left-handed operator.
Student or Learner