In astronomy|lang=en terms the difference between superoutburst and supercycle
is that superoutburst is (astronomy) a very large outburst (from a nova etc) while supercycle is (astronomy) a regular cycle of superoutbursts.
As nouns the difference between superoutburst and supercycle
is that superoutburst is (astronomy) a very large outburst (from a nova etc) while supercycle is (astronomy) a regular cycle of superoutbursts.