Here's what rhymes with mononuclear.

Consider these alternatives

leukocytes / rights phagocyte / might polymorphonuclear / morphonuclear phagocytes / rights erythrocytes / rights eosinophils / years neutrophils / years megakaryocytes / rights leukemic / phonemic degranulation / relation haematopoietic / hematopoietic histiocytes / rights basophils / years granulocytes / rights chromaffin / having reticulocytes / rights eosinophil / will leukocytosis / diagnosis multinucleated / created monocytes / rights lymphocytes / rights unconjugated / dated cll / cr intermediacy / immediacy multinucleate / late meristematic / dramatic hematopoietic / haemopoietic nucleated / created leukopenia / neutropenia amacrine / line hemolysis / autohemolysis thymocytes / rights