detective vs dick

detective and dick both are nouns.

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

As nouns, dick is a hyponym of detective; that is, dick is a word with a more specific, narrower meaning than detective:

Other hyponyms of detective include gumshoe, hawkshaw, plainclothesman, tracer.

detective (noun)	dick (noun)
a police officer who investigates crimes	obscene terms for penis
an investigator engaged or employed in obtaining information not easily available to the public	someone who is a detective