different between avowance vs taxonomy

English

avow +? -ance

avowance (usually uncountable, plural avowances)

(obsolete) The act of avowing; avowal.
(obsolete) An upholding; defence; vindication.
- 1648, Thomas Fuller, The History of the University of Cambridge since the Conquest
  Can my avowance of king-murdering be collected from anything here written by me?

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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