saboteur vs fifth columnist

saboteur and fifth columnist both are nouns.

Word	Noun	Adjective	Verb	Adverb
saboteur	Yes	No	No	No
fifth columnist	Yes	No	No	No

As nouns, saboteur and fifth columnist are synonyms defined as:

saboteur and fifth columnist: a member of a clandestine subversive organization who tries to help a potential invader

saboteur (noun)	fifth columnist (noun)
someone who commits sabotage or deliberately causes wrecks	a member of a clandestine subversive organization who tries to help a potential invader
a member of a clandestine subversive organization who tries to help a potential invader