Taxonomy is the science of defining and naming groups of biological organisms on the basis of shared characteristics. Organisms are grouped together into taxa and these groups are given a taxonomic rank; groups of a given rank can be aggregated to form a super-group of higher rank, thus creating a taxonomic hierarchy.
Merriam-Webster Online Dictionary
taxonomy (noun)1.
the study of the general principles of scientific classification - systematics
2.
- classification , especially orderly classification of plants and animals according to their presumed natural relationships
Sorting, Grouping, Taxonomy, Labeling, Ranking