different between investigational vs taxonomy

English

investigation +? -al

investigational (not comparable)

Of, or relating to investigating, or to an investigation.
(medicine) of, or relating to an unapproved drug or chemical entity being studied.
An expanded access protocol allows patients to benefit from an investigational drug prior to FDA approval.

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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