Convolutional neural networks or CNNs have become synonyms with deep learning. The term convolutional is defined as relating to the process of convolution, which refers to the mathematical operation of combining two functions to produce a third. Some synonyms for the word convolutional could be "circular", "rolling", or "twisted". These terms relate to the fact that CNNs process input data through a series of sliding convolutional filters, which can be thought of as rolling or twisting over the input data. Another synonym could be "filter-based", emphasizing the role of filters in extracting features from the input data. Overall, these synonyms help capture the unique characteristics of CNNs, which have revolutionized the field of computer vision and beyond.