Polymorphemic is a term that refers to a word with multiple morphemes, or units of meaning. Synonyms for polymorphemic include "complex," "compounded," "multipart," "multi-segment," and "multi-morphemic." These words all convey the idea of something that is made up of multiple parts or pieces. Other synonyms for polymorphemic might include "morphologically complex," "morphologically composite," or "morphologically rich." Regardless of the specific synonym used, all of these terms describe a word that has more than one meaningful unit, which can make it more challenging to analyze and understand than a word with only one morpheme.