What you are looking for is an “Access Point”, this is basically like a router except specifically designed to connect via Ethernet and broadcast a WiFi signal, but not do any NAT or routing or modem-like behavior.
Another term to look for is “wired backhaul network extender”. Some ISPs may have a recommendation for specific devices to serve this role and known to interoperate with their “modem”.
What you are looking for is an “Access Point”, this is basically like a router except specifically designed to connect via Ethernet and broadcast a WiFi signal, but not do any NAT or routing or modem-like behavior.
Another term to look for is “wired backhaul network extender”. Some ISPs may have a recommendation for specific devices to serve this role and known to interoperate with their “modem”.