service-names command outputs not all services, search using service [service_name] work fine even if service-names can't see it.
In this example, service-names will find only rtsp and http, but not msrpc, netbios-ssn and microsoft-ds. Maybe there are others.
<host starttime="1695669443" endtime="1695669871"><status state="up" reason="user-set" reason_ttl="0"/>
<address addr="192.168.205.7" addrtype="ipv4"/>
<hostnames>
</hostnames>
<ports><extraports state="filtered" count="995">
<extrareasons reason="no-response" count="995" proto="tcp" ports="some_ports"/>
</extraports>
<port protocol="tcp" portid="135"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="msrpc" product="Microsoft Windows RPC" ostype="Windows" method="probed" conf="10"><cpe>cpe:/o:microsoft:windows</cpe></service></port>
<port protocol="tcp" portid="139"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="netbios-ssn" product="Microsoft Windows netbios-ssn" ostype="Windows" method="probed" conf="10"><cpe>cpe:/o:microsoft:windows</cpe></service></port>
<port protocol="tcp" portid="445"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="microsoft-ds" method="table" conf="3"/></port>
<port protocol="tcp" portid="554"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="rtsp" method="table" conf="3"/></port>
<port protocol="tcp" portid="2869"><state state="open" reason="syn-ack" reason_ttl="0"/><service name="http" product="Microsoft HTTPAPI httpd" version="2.0" extrainfo="SSDP/UPnP" ostype="Windows" method="probed" conf="10"><cpe>cpe:/o:microsoft:windows</cpe></service></port>
</ports>
</host>
service-names command outputs not all services, search using service [service_name] work fine even if service-names can't see it.
In this example, service-names will find only rtsp and http, but not msrpc, netbios-ssn and microsoft-ds. Maybe there are others.