Stander (noun)

1. A person who stands.
2. A person who is present or in attendance.
3. A person who is waiting or watching for something to happen.

Origin:

Late 19th century: from stand + -er.

Examples:

1. The stander watched the parade go by from the sidewalk.
2. The stander was waiting for his friend to come out of the store.
3. The stander was one of many spectators at the sporting event.
4. The stander was the only one not seated in the crowded theater.
5. The stander was eager to see the result of the competition.