In chemistry terms the difference between substituent and monosubstituted
is that substituent is any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed while monosubstituted is having a single substituent.
As a noun substituent
is any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed.
As an adjective monosubstituted is
having a single substituent.
substituent
English
Noun
(
en noun)
(chemistry) any atom, group, or radical substituted for another, or entering a molecule in place of some other part which is removed
(grammar) pro-form
monosubstituted
English
Adjective
(-)
(chemistry) Having a single substituent