at this time it is metal oxide field effect transistor. 20 years ago it was mostly bipolar junction transistor, 45 years ago it was point contact or surface barrier transistor. before that it was vacuum tubes and germanium point contact diodes.

in the future it may be nanotube field effect transistors, or even DNA logic. both would probably be operating in a thin film of some liquid which would have to be encapsulated.

MOSFET is Metal Oxide Semiconductor Field Effect Transistor.

IGFET Insulated Gate Field Effect Transistor.

But these expressions are practically synonyms.

Field Effect Transistor

A: basically a silicon bar where the conduction is controlled by a field since there is no connection to the gate the impedance is very high

Its a Transistor used in JFET (Junction Field Effect Transistor)

Carbon remain carbon.