betatron vs atom smasher

betatron and atom smasher both are nouns.

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

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

betatron: accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux
atom smasher: a scientific instrument that increases the kinetic energy of charged particles

Other hypernyms of betatron include accelerator, particle accelerator.

betatron (noun)	atom smasher (noun)
accelerates a continuous beam of electrons to high speeds by means of the electric field produced by changing magnetic flux	a scientific instrument that increases the kinetic energy of charged particles