Second stringers are the individuals who are not the top choice for a position but serve as backup options instead. Some synonyms for this term include reserves, substitutes, backups, alternates, understudies, and stand-ins. These words are often used in sports to describe the team members who do not start the game but are ready if needed. However, they can also be used in other settings such as work or social situations. Other similar terms include secondary options, supporting cast, and second tier. While these terms may suggest a lower status or importance, they are still essential in making the team or group function smoothly.