The term 'EGG PART' refers to the different parts of an egg. The four crossword solutions are YOLK (4 letters), ALBUMEN (7 letters), SHELL (5 letters), and YOKE (4 letters). The YOLK is the yellow center of the egg, which contains most of the egg's fat and protein. The albumen is the WHITE of the egg, which is made up of mostly water and protein. The SHELL is the hard outer layer of the egg, which protects the egg from bacteria and other contaminants. The YOKE is the yellow part of the egg, which contains the majority of the egg's vitamins and minerals.