a network (interconnected group or system) / a network (directory of people) / a network (multiple computers and other devices connected together)

national, of or for a nation or its citizens / national, state, of or having to do with a country / nationwide, throughout a country

(historical) NATIONAL, former name of Panasonic; Matsushita Electric

cable network (as in a channel for cable television)

(artificial intelligence) a neural network

(American football) (sports) National Football League (NFL)

(computing) Simple Network Management Protocol, SNMP