The best replacement for dfd is uml.

The best alternatives to dfd are rated as following:
★★★★★  uml
★★★★★  erd
★★★  flowchart
★★★  use case
★  bpmn
★  activity diagram
★  physical dfd
★  data dictionary
  activity diagrams
  logical dfd
  data flow diagram
  pfd
  flow chart
  flow charts

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dfd
uml
erd