1) Dancer 2) English invention 3) Social dancer 1) Matilda 
A waltzer is a fairground ride that consists of a number of cars which are free to spin individually while rotating around a central point like a carousel. The floor of the ride is not flat and the cars rise and fall gently as the ride spins, the offset weight of the riders causing each car to rotate unpredictably. Sometimes an operator will ride ...
• (n.) A person who waltzes.
Waltz'er noun A person who waltzes. 
[n] - a dancer who waltzes
noun a dancer who waltzes