WordNet sense 1 (a message describing how something is to be done):

direction

WordNet sense 2 ((computer science) a line of code written as part of a computer program):

command, statement, program line

WordNet sense 3 (the profession of a teacher):

pedagogy, teaching

WordNet sense 4 (the activities of educating or instructing; activities that impart knowledge or skill):

education, didactics, educational activity