What is a bundle of axons known as?
Nerve
A nerve is an enclosed bundle of axons which carries information to and from the central nervous system. Many axons are enclosed in a common layer of connective tissue along with few blood vessels. Based on the function, nerves are of three types: Sensory, Motor and Mixed.
Neuron a single cell which is the basic structural and functional unit of the nervous system and dendrites and cell body are all parts of this cell. Axon is the longest extension.