hotel detective vs sherlock

hotel detective and sherlock both are nouns.

Word	Noun	Adjective	Verb	Adverb
hotel detective	Yes	No	No	No
sherlock	Yes	No	No	No

As nouns, sherlock is a hypernym of hotel detective; that is, sherlock is a word with a broader meaning than hotel detective:

hotel detective: a private detective employed by a hotel or retail store
sherlock: someone who can be employed as a detective to collect information and assist in criminal investigations

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

hotel detective (noun)	sherlock (noun)
a private detective employed by a hotel or retail store	someone who can be employed as a detective to collect information and assist in criminal investigations