From largest/most general to smallest/most specific:

- domain
- kingdom 
- phylum (in zoology) / division (in botany)	
- class 
- order
- family
- genus
- species

Main Taxonomic Ranks in Biology

The arrangement of taxonomic ranks into "higher" and "lower" levels according to level of specificity.

Georgetown University

- Taxa
- Taxonomic Rank
- Taxonomic hierarchy

Components of a biological taxonomy

Larger more general categories and concepts are at the top and flow into smaller more specific subcategories and concepts creating a hierarchy.

Hierarchical organization

Wikipedia

A taxon (plural: taxa) is a group of organisms decided to be a unit, usually given a name and rank.

Taxon / Taxa

The level of a taxon in a taxonomic hierarchy, meaning the level of specificity the taxon is defined with relative to other taxons.

Taxonomic rank

According to Rosch, categories can be organized by hierarchical levels based on the size and specificity of the category compared to others it encompasses or is encompassed by. They are said to be broken down into three main levels:
- The global (superordinate)
- The basic
- The specific (subordinate)

Rosch's approach to Hierarchical Organization of Categories 

Concepts and categories are organized in hierarchical networks based on meaning.

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