Hi SOAP is A lightweight XML-based protocol for exchanging messages in a decentralized, distributed environment. SOAP can be used to query and return information and invoke services across the Internet.
SOAP server is a server enabled to understand a SOAP message and map it to WS which it neeed to be passed . for example you can use Tomcat with Axis to understand your SOAP message for invoking WS services. I did not heared term SOAP SERVER any way