different between luckless vs taxonomy

English

luck +? -less

luckless (comparative more luckless, superlative most luckless)

Unsuccessful, in a failing manner.
The search party returned dejected from the luckless search.
Without luck.
- 1976, Donald Fagen with Steely Dan, "Don't Take Me Alive":
  Agents of the law, luckless pedestrian

Borrowed from French taxonomie. Surface analysis taxo- +? -nomy.

taxonomy (countable and uncountable, plural taxonomies)

The science or the technique used to make a classification.
A classification; especially, a classification in a hierarchical system.
(taxonomy, uncountable) The science of finding, describing, classifying and naming organisms.

taxonomics
(science of finding, describing, classifying and naming organisms): alpha taxonomy

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