Crossword clues for the word: JAMESWATT The word JAMESWATT has appeared as an answer to at least 5 crossword clues on different crossword puzzles. Crossword clues for JAMESWATT Showing 1 to 5 of 5 results Clue(s) Engineer who introduced the term "horsepower" Ex-Cabinet member or Scottish inventor Inventor of an improved steam engine: 2 wds. Pioneer in steam engines Reagan's first secretary of the Interior