50 synonyms for segment such as compartment, bit, break up, and carve up. Segment is a noun, and its antonyms are whole and amalgamate.
Bit, branch, chunk, compartment, component, constituent, department, division, element, fraction, fragment, hunk, ingredient, lump, module, parcel, part, piece, portion, section, sector, slab, slice, subdivision, tranche, unit, wedge, wing, and wodge.
Break up, carve up, compartment, cut up, dismember, distribute, divide, divide up, divorce, partition, portion out, section, segregate, separate, sever, share out, slice up, split, split up, and subdivide.