mugshot vs mug shot

mugshot and mug shot both are nouns.

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

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

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

mugshot (noun)	mug shot (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)