mug shot vs mugshot

mug shot and mugshot both are nouns.

Word	Noun	Adjective	Verb	Adverb
mug shot	Yes	No	No	No
mugshot	Yes	No	No	No

As nouns, mug shot and mugshot are synonyms defined as:

mug shot and mugshot: a photograph of someone's face (especially one made for police records)

mug shot (noun)	mugshot (noun)
a photograph of someone's face (especially one made for police records)	a photograph of someone's face (especially one made for police records)