NM network module refers to the expantion slot where allows for installation of other interfaces that provides for various services depending on the platform for example you may find a 16 port switch module or a two FE module to be installed in the NM slot etc.. you would see the part number begining with NM , the WIC cards are mostly wan cards E1, T1 etc, you could also find a network module where you can install WIC cards as well..
Feature cards, interfaces, etc, can come in NM or WIC cards. Just make sure the card you are using is supported by the router you want to use it in. Routers which have WIC and NM slots typically have more WIC slots than NM slots.
This is a very general question, but hopefully I provided some insight for you.
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