linac vs linear accelerator

linac and linear accelerator both are nouns.

Word	Noun	Adjective	Verb	Adverb
linac	Yes	No	No	No
linear accelerator	Yes	No	No	No

As nouns, linac and linear accelerator are synonyms defined as:

linac and linear accelerator: ions are accelerated along a linear path by voltage differences on electrodes along the path

linac (noun)	linear accelerator (noun)
ions are accelerated along a linear path by voltage differences on electrodes along the path	ions are accelerated along a linear path by voltage differences on electrodes along the path