investigative vs investigatory

investigative and investigatory both are adjectives.

Word	Noun	Adjective	Verb	Adverb
investigative	No	Yes	No	No
investigatory	No	Yes	No	No

As adjectives, investigative and investigatory are synonyms defined as:

investigative and investigatory: designed to find information or ascertain facts

Other synonyms of investigative include fact-finding.

investigative (adjective)	investigatory (adjective)
designed to find information or ascertain facts	designed to find information or ascertain facts