different between showup vs showdown

English

show up; compare lineup.

showup (plural showups)

The showing of a suspect to a victim by police in the hope of identifying the suspect as the culprit.
- 2008, Ronald J. Bacigal, Criminal Law and Procedure: An Overview (page 160)
  Following arrest, the most commonly used identification procedures are lineups, showups, photographic arrays, fingerprinting, DNA,...

show +? down

showdown (countable and uncountable, plural showdowns)

The final battle between two nemeses, in which there can be but one victor.
(poker) The final round in a poker match, where the all remaining players' cards have to be put down on the table and shown.

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