shamus vs detective

shamus and detective both are nouns.

Word	Noun	Adjective	Verb	Adverb
shamus	Yes	No	No	No
detective	Yes	No	No	No

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

shamus: someone who can be employed as a detective to collect information and assist in criminal investigations
detective: an investigator engaged or employed in obtaining information not easily available to the public

shamus (noun)	detective (noun)
someone who can be employed as a detective to collect information and assist in criminal investigations	a police officer who investigates crimes
	an investigator engaged or employed in obtaining information not easily available to the public