fissiparous vs breakaway

fissiparous is not a noun while breakaway is a noun.

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

As adjectives, fissiparous and breakaway are synonyms defined as:

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

Other synonyms of fissiparous include separatist.

fissiparous (noun)	breakaway (noun)
	the act of breaking away or withdrawing from

fissiparous (adjective)	breakaway (adjective)
reproducing by fission	having separated or advocating separation from another entity or policy or attitude
having separated or advocating separation from another entity or policy or attitude