As adjectives the difference between bleach and disinfectant
is that
bleach is (archaic) pale; bleak while
disinfectant is referring to something that contains a disinfectant or has the properties of a disinfectant.
As nouns the difference between bleach and disinfectant
is that
bleach is (uncountable) a chemical, such as sodium hypochlorite or hydrogen peroxide, or a preparation of such a chemical, used for disinfecting or whitening or
bleach can be an act of bleaching; exposure to the sun or
bleach can be a disease of the skin while
disinfectant is a substance which kills germs and/or viruses.
As a verb bleach
is to treat with bleach, especially so as to whiten (fabric, paper, etc) or lighten (hair).