Definitions of tool:

• noun:   an implement used in the practice of a vocation
• noun:   the means whereby some act is accomplished

  Example: "Science has given us new tools to fight disease"

• noun:   a person who is controlled by others and is used to perform unpleasant or dishonest tasks for someone else
• noun:   obscene terms for penis
• verb:   drive

  Example: "The convertible tooled down the street"

• verb:   furnish with tools
• verb:   work with a tool
• verb:   ride in a car with no particular goal and just for the pleasure of it

  Example: "We tooled down the street"