A gold digger (two words, no hyphen) is literally someone who digs for gold. Figuratively, it refers to someone who pursues a romantic relationship for the purpose of financial gain. In the past, a gold digger has usually been female, though in modern times, this may be changing. "She's a gold digger; she only married him for his money." https://www.merriam-webster.com/dictionary/gold%20digger

A gold-digger is a person (usually a woman) who has a relationship with someone who is rich in order to get money and gifts from that person