The synonym for fill depends on which meaning of fill you intend, as fill is a versatile verb and noun with many uses. As a verb meaning to make full, synonyms include replenish, load, pack, stuff, cram, top up, fill up, saturate, and flood. When fill means to occupy a position, synonyms include occupy, take, hold, assume, staff, and cover. When fill means to complete a form, synonyms include complete, fill out, fill in, answer, and supply. When fill means to satisfy a need or order, synonyms include satisfy, meet, fulfill, execute, provide, and supply. When fill means to pervade, synonyms include pervade, permeate, suffuse, and imbue. As a noun meaning enough, as in eat your fill, synonyms include sufficiency, ample amount, fullness, and satisfaction. For material used to fill, synonyms include filler, stuffing, padding, packing, and infill. So there is no single synonym that fits all uses. For general use meaning to make full, best synonyms are pack, load, replenish, and top up. For formal writing, occupy, satisfy, or complete may be more appropriate depending on sentence.
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