A : Have you change for 100 rupees?
B: I have 5,000 rupees but all 1,000 rupees notes. So I can't give you change.
Is there any word to replace `change'?
'Change' is the obvious choice of words in that context - sometimes as a noun (as in your example) and sometimes as a verb: 'Can you change 100 rupees'.
Sometimes a shopkeeper will say 'Do you have the right change?' (say, early in the morning, when changing a large note is impossible), or 'Do you have anything smaller?'
B, returning to your example, might say 'Sorry - the smallest I've got is a thousand.' In that case he probably wouldn't bother with the second sentence - which is obviously the case.