MOSFET is equivalent to a relay? The last CMOS op amp I used begs to differ!
And the JFET is a solid-state equivalent to a tube! BJTs are pretty unique.
As a Greybeard,I think of the dual gate devices used as RF preamps & mixers in receivers at up to UHF when I hear the term,MOSFET.
Many younger people only know them as high voltage switches.
Actually tubes are more like MOSFETs than JFETS in many ways,although you
can draw grid current.
In my last job,we were using LDMOS devices at around 400MHz.
Each package was a push-pull pair of devices,with the combination producing 300watts.they were in turn,combined to produce 1200 watts.---not bad for MOS devices which are "limited in RF use",as an earlier poster declared.