far-out vs offbeat

far-out is not a noun while offbeat is a noun.

Word	Noun	Adjective	Verb	Adverb
far-out	No	Yes	No	No
offbeat	Yes	Yes	No	No

As adjectives, far-out and offbeat are synonyms defined as:

Other synonyms of far-out include kinky, quirky, way-out.

far-out (noun)	offbeat (noun)
	an unaccented beat (especially the last beat of a measure)

far-out (adjective)	offbeat (adjective)
(informal) strikingly unconventional	(informal) strikingly unconventional