case-sensitive
adjective
case-sen·si·tive
ˈkās-ˈsen(t)-sə-tiv
-ˈsen(t)s-təv
: requiring correct input of uppercase and lowercase letters
Having the Caps Lock key on accidentally can also lead to a frustrating series of "wrong password" alerts when trying to use a case-sensitive password for your office network or Internet provider.—J. D. Biersdorfer
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Merriam-Webster unabridged
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