adjuster vs investigator

adjuster and investigator both are nouns.

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

As nouns, investigator is a hypernym of adjuster; that is, investigator is a word with a broader meaning than adjuster:

adjuster: one who investigates insurance claims or claims for damages and recommends an effective settlement
investigator: someone who investigates

adjuster (noun)	investigator (noun)
one who investigates insurance claims or claims for damages and recommends an effective settlement	someone who investigates
	a scientist who devotes himself to doing research
	a police officer who investigates crimes