For AMD GPU-s, are followings equivalent?

While studying, architecture, I came across dizzying array of terminology which I think I all sorted out but the most number of equivalent terms used for following entity. Basically each ALU within the SIMD is being referred by so many different names:
Shader unit
Streaming processor
Work item (software centric way)
PE-processing element

Is that case?

This may help:

See the glossary table on pgs. 31-32. For ALU, see the Description column.

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