There are 6 13-letter words that start with 'mac'.
| machicolation | machinability |
| macroeconomic | macroglobulin |
| macromolecule | macronutrient |
Note: These 6 13-letter words that start with 'mac' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with macr, mach, maca, mace, macu, mack, macc, maci, macl, maco, macs.
4-letter words start with 'mac' (4)