The word you're referring to seems to be a typo. Based on the context and the requirement to analyze the word, I will assume that the intended word is "synonym." A synonym is a word that has the same or nearly the same meaning as another word in the same language. Synonyms can be used to avoid repetition and to add variety to writing and speech.
The word "synonym" comes from the late Latin word synonymum, which in turn comes from the Greek synonymon (from syn- meaning "together" + onuma meaning "name"). This reflects the idea that synonyms are "names" that can be used interchangeably.