The main difference between host and server is that host is a computer or another device that connects to the network while a server is a software or a hardware device that provides services to other programs or devices in the network.
A computer network is a collection of computing devices connected together to communicate and share resources. The host and server are two terms in computer networking. A host is a device that connects to the network. It is also called a node. It can be a device such as a desktop computer, laptop etc. On the other hand, a server provides various facilities for the other devices in the network. For example, a file server stores and manages the files in the network.