cyclotron vs atom smasher

cyclotron and atom smasher both are nouns.

Word	Noun	Adjective	Verb	Adverb
cyclotron	Yes	No	No	No
atom smasher	Yes	No	No	No

As nouns, atom smasher is a hypernym of cyclotron; that is, atom smasher is a word with a broader meaning than cyclotron:

cyclotron: an accelerator that imparts energies of several million electron-volts to rapidly moving particles
atom smasher: a scientific instrument that increases the kinetic energy of charged particles

Other hypernyms of cyclotron include accelerator, particle accelerator.

cyclotron (noun)	atom smasher (noun)
an accelerator that imparts energies of several million electron-volts to rapidly moving particles	a scientific instrument that increases the kinetic energy of charged particles