nmap-suid is just the nmap part (no zenmap, ncat etc) of the nmap project. This nmap version has setuid, so it runs as root. This way it can retrieve more info than running as a regular user.
It is solely meant for supporting the InfraView app.
Quoting the nmap executable:
WARNING: Running Nmap setuid, as you are doing, is a major security risk.
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