investigator vs dick

investigator and dick both are nouns.

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

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

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

investigator (noun)	dick (noun)
someone who investigates	obscene terms for penis
a scientist who devotes himself to doing research	someone who is a detective
a police officer who investigates crimes