The best replacement for identity is role confusion.

The best alternatives to identity are rated as following:
★★★★★  role confusion
★★★  identity confusion
★★  confusion
★★  role diffusion
★★  personality
★★  no solution
★  conditional equation
★  self
★  role
★  inferiority
★  identification
★  branding
★  culture
  contradiction
  self concept
  bourne supremacy
  logo
  similarity
  conditional
  equality
  contradiction math
  guid
  inverse
  role confusion erikson
  identity
  subjectivity
  primary key
  inconsistent
  sexual orientation
  image
  uniqueidentifier
  no identity
  sequence

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Speaking about identity, one probably shouldn't forget about select into.

Other search terms related to identity and their ratings are:
★★★★★ select into
★★★★★ provisioning profile
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Google Trends

Scale is based on the average worldwide traffic of identity in all years. Click on graph for more.
identity
role confusion
identity confusion