The word "interlay" can be defined as to lay something between or among other things. It's a versatile word that has multiple synonyms within the English language. Some of the synonyms for interlay include intersperse, interweave, interlace, interpose, sandwich, and insert. These words represent the idea of placing something between two or more objects or substances. The use of these synonyms can provide a way to add variety and creativity to a piece of writing. These words are especially useful when describing a physical object, a process or an action where something is placed between two or more things.