moderationist vs middle of the roader

moderationist and middle of the roader both are nouns.

Word	Noun	Adjective	Verb	Adverb
moderationist	Yes	No	No	No
middle of the roader	Yes	No	No	No

As nouns, moderationist and middle of the roader are synonyms defined as:

moderationist and middle of the roader: a person who takes a position in the political center

Other synonyms of moderationist include centrist, moderate.

moderationist (noun)	middle of the roader (noun)
a person who takes a position in the political center	a person who takes a position in the political center
a moderate drinker (as opposed to a total abstainer)