atom smasher vs linac

atom smasher and linac both are nouns.

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

As nouns, linac is a hyponym of atom smasher; that is, linac is a word with a more specific, narrower meaning than atom smasher:

atom smasher: a scientific instrument that increases the kinetic energy of charged particles
linac: ions are accelerated along a linear path by voltage differences on electrodes along the path

atom smasher (noun)	linac (noun)
a scientific instrument that increases the kinetic energy of charged particles	ions are accelerated along a linear path by voltage differences on electrodes along the path