Final answer:
In Morse code, words are separated by a space equivalent to seven dots. Samuel Morse's invention was critical in revolutionizing communication, setting the stage for the eventual transmission of voice and other sounds.
Step-by-step explanation:
The question what separates words in Morse code is answered by understanding the structure of Morse code. Morse code separates letters with a short pause and words with a longer pause, specifically, a space equivalent to seven dots. These pauses are essential for clear deciphering of messages.
Samuel Morse, the inventor of the telegraph, developed a code based on short and long signals that translated into letters, which enabled it to be used for sending messages. This revolutionized communication by allowing messages to travel faster than ever before, surpassing even the speed of a messenger on horseback.
In Marconi's system, Morse code was the only method of communication, catalyzing the development of early sound transmission technologies, though these were initially commercially unsuccessful. These efforts, however, set the groundwork for the voice and other sound transmissions that came later.