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Scope creep
occurs when decisions are made to implement additional functionality beyond what was defined in the project scope
of Creep, of Creep, imp. & p. p. of Creep.
Yes, creep is a noun, as in "he was a creep". It can also be a verb, as in "he crept along".
Cause a Creep creep's up on someone slowly and a Creep is very slow