mug book vs mug file

mug book and mug file both are nouns.

Word	Noun	Adjective	Verb	Adverb
mug book	Yes	No	No	No
mug file	Yes	No	No	No

As nouns, mug book and mug file are synonyms defined as:

mug book and mug file: a file of mug shots (pictures of criminals that are kept on file by the police)

mug book (noun)	mug file (noun)
a file of mug shots (pictures of criminals that are kept on file by the police)	a file of mug shots (pictures of criminals that are kept on file by the police)