private eye vs sherlock

private eye and sherlock both are nouns.

Word	Noun	Adjective	Verb	Adverb
private eye	Yes	No	No	No
sherlock	Yes	No	No	No

As nouns, private eye and sherlock are synonyms defined as:

private eye and sherlock: someone who can be employed as a detective to collect information and assist in criminal investigations

Other synonyms of private eye include operative, PI, private detective, private investigator, shamus.

private eye (noun)	sherlock (noun)
someone who can be employed as a detective to collect information and assist in criminal investigations	someone who can be employed as a detective to collect information and assist in criminal investigations