separatist vs breakaway

separatist and breakaway both are nouns.

Word	Noun	Adjective	Verb	Adverb
separatist	Yes	Yes	No	No
breakaway	Yes	Yes	No	No

As adjectives, separatist and breakaway are synonyms defined as:

separatist and breakaway: having separated or advocating separation from another entity or policy or attitude

Other synonyms of separatist include fissiparous.

separatist (noun)	breakaway (noun)
an advocate of secession or separation from a larger group (such as an established church or a national union)	the act of breaking away or withdrawing from

separatist (adjective)	breakaway (adjective)
having separated or advocating separation from another entity or policy or attitude	having separated or advocating separation from another entity or policy or attitude