moderator vs modifier

moderator and modifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
moderator	Yes	No	No	No
modifier	Yes	No	No	No

As nouns, modifier is a hyponym of moderator; that is, modifier is a word with a more specific, narrower meaning than moderator:

moderator (noun)	modifier (noun)
someone who mediates disputes and attempts to avoid violence	a gene that modifies the effect produced by another gene
someone who presides over a forum or debate	a content word that qualifies the meaning of a noun or verb
in the Presbyterian church, the officer who presides over a synod or general assembly	a person who changes something
any substance used to slow down neutrons in nuclear reactors	a moderator who makes less extreme or uncompromising