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

Georgetown University

- Taxa
- Taxonomic Rank
- Taxonomic hierarchy

Components of a biological taxonomy

Wikipedia

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

Taxon / Taxa

Taxonomic rank

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

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