Stayer is a word that refers to someone or something that remains in a particular place or situation for an extended period. As such, there are several synonyms that can be used to describe this concept. For example, someone who is a stayer can also be called a perseverer, a resolute person, a stalwart, or a committed individual. Other similar words might include steadfast, dedicated, loyal, determined, and persistent. Ultimately, these synonyms all capture the idea of someone who is willing to stay in a particular place or situation for a long time, often because they believe that it is the right thing to do.