jailer vs prison guard

jailer and prison guard both are nouns.

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

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

Other synonyms of jailer include gaoler, jailor, screw, turnkey.

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