prison guard vs turnkey

prison guard and turnkey both are nouns.

Word	Noun	Adjective	Verb	Adverb
prison guard	Yes	No	No	No
turnkey	Yes	No	No	No

As nouns, prison guard and turnkey are synonyms defined as:

Other synonyms of prison guard include gaoler, jailer, jailor, screw.

prison guard (noun)	turnkey (noun)
someone who guards prisoners	someone who guards prisoners