fairly vs moderately

fairly and moderately both are adverbs.

Word	Noun	Adjective	Verb	Adverb
fairly	No	No	No	Yes
moderately	No	No	No	Yes

As adverbs, fairly and moderately are synonyms defined as:

Other synonyms of fairly include jolly, middling, passably, pretty, reasonably, somewhat.

fairly (adverb)	moderately (adverb)
without favoring one party, in a fair evenhanded manner	to certain extent or degree
to certain extent or degree	with moderation; in a moderate manner
in conformity with the rules or laws and without fraud or cheating