Can't the 737 land overweight in case of a return?
Yep, so can a 747-400. Right up to MTOW, subject to runway length and
in an emergency.
If it's not so serious, burn it off or dump.
Some aircraft will still be overweight after dumping, like the 767-300 which can only dump from the centre fuel tank. The wing tanks will still be full and with a decent payload it will still be above MLW after dumping.
Other types with no fuel dump facility that spring to mind are the A320 family, 757, 767-200 (all?), 767-300 (some), A330 (some).