As nouns the difference between nucleoside and bromodeoxyuridine

is that nucleoside is an organic molecule in which a nitrogenous heterocyclic base (or nucleobase), which can be either a double-ringed purine or a single-ringed pyrimidine, is covalently attached to a five-carbon pentose sugar (deoxyribose in DNA or ribose in RNA). When the phosphate group is covalently attached to the pentose sugar, it forms a nucleotide while bromodeoxyuridine is a synthetic nucleoside which is an analogue of thymidine; it is commonly used in the detection of proliferating cells in living tissues, where it competes with uridine.