Here's what rhymes with subsubstance.
Words that almost rhyme with subsubstance
sustenance subtilis succulence subtenants suddenness humbleness cussedness succulents suffocates unctuousness sodomise supplements covenants supplicants truculence customised sumptuousness sultriness bumptiousness colourlessness customise chumminess gutlessness drunkenness gluttonous bloodlessness colourfulness crumminess voluptuous trustfulness accompanists penultimates presumptuous presumptuousness rambunctiousness obstructionists constructionists deconstructionists