Fill is a versatile word that can mean to make something full or to occupy space. There are many synonyms for this word, each with its own nuance and meaning. To pack tightly or cram something full, you could use words like stuff, jam, or crowd. To put a small amount of something into a container, you might use the words scoop, spoon, or ladle. When referring to a piece of writing, words like complete, finish or expand could be used. Other options include replenish for refilling, saturate to mean completely filling, and load or stock for stocking. With so many synonyms, there's no shortage of ways to express the concept of filling something.