Take a look here, Online Etymology Dictionary, especially at the origin of the words.
Student or Learner
I would like to know if this concept is correct of homonymy:
“tap” means to hit lightly whereas another meaning is it is an object to draw liquid from. This word has indirect meaning; therefore, this is a case of homonymy.
Besides, they don't have any common semes to be regarded as members of one and the same family.
Unlike, for example, to look - a look, to turn - a turn,
which may serve as examples of a word-formation by the method of conversion.