Here's what rhymes with pycnonuclear.
nuclear nonnuclear mononuclear thermonuclear antinuclear Words that almost rhyme with pycnonuclear
moodier newsier unrulier kookier sunnier roomier spookier goofier loonier loopier rubier boozier woozier gloomier fumier groovier droopier plumier broodier scuzzier schoolteacher proofreader