Here's what rhymes with smouldering.

Consider these alternatives

charred / part embers / members rubble / double sifting / existing littering / considering strewn / soon debris / be rages / native oozing / using littered / considered stench / end reeking / speaking undergrowth / growth underbrush / love gutted / budget unrecovered / covered decaying / saying wrecked / effect decayed / made bloodied / studied