Comment by _wldu

Some people seem to be unaware of apropos too (old text based cli tool).

    $ apropos network
    interfaces (5)       - network interface configuration for ifup and ifdown
    aseqnet (1)          - ALSA sequencer connectors over network
    byteorder (3)        - convert values between host and network byte order
    ctstat (8)           - unified linux network statistics