The term 'foremost part' can be broken down into two crossword solutions: 'FRONT' (5 letters) and 'VANGUARD' (8 letters). 'FRONT' is a noun that refers to the most forward position or leading position in any group or organization. 'VANGUARD' is a noun that refers to a group of people leading the way in new developments or ideas, especially in politics or social issues. Together, these two words describe the most important or leading part of something.