The on-line medical dictionaries suggest no special meaning for 'substitute', mdl.
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studentmdlO i understood teacher. can i say replacement also?? my doubt is cleared. smdlYes, you can. E.g. Medicine A is out of stock, so it is replaced by medicine X, which can be used for the same illness. Hence medicine B is the replacement.for medicine A.
Then why are you taking up our time here? Just ask your professor all your questions. After all, he is paid to answer them; we are not.
my professor said to use substitute. substitute is correct