Denser rhymes with:
condenser, biosensor, censer, censor, condenser, dispenser, ensor, mencer, menser, sensor, spencer, spenser
Denser sounds like:
daenzer, dancer, danger, danker, danser, dansereau, danzer, danziger, deininger, demagoguery, demonizer, denker, denninger, denzer, dettinger, dinger, dinosaur, doniger, doomsayer, dunker