Compare the MOSFET and LDMOSFET
A MOSFET is a metal–oxide–semiconductor field-effect transistor used for switching and amplification.

An LDMOS FET is a laterally diffused metal oxide semiconductor. They are typically used in power amplifiers for radio and microwave frequencies.

From the Wikipedia page:


  Silicon-based LDMOS FETs are widely used in RF power amplifiers for base-stations as the requirement is for high output power with a corresponding drain to source breakdown voltage usually above 60 volts.


If you need more specific information, you'll have to compare a particular MOSFET to a particular LDMOS FET.