Fossil is a word commonly used to describe a preserved remnant of a once living organism. However, there are several synonyms for this word that can be used in different contexts. One of the most relevant synonyms is "relic", which is used to refer to something that is surviving from the past. Other possible synonyms include "vestige", "trace", "remnant", and "ruin". These words are used to describe different aspects of what remains from a once thriving organism or structure. Regardless of the synonym used, the aim is to describe something that has a significant historical meaning and ultimately adds to our understanding of the past.