One or more families grouped together, distinugishes differences within a class.

Superorders and suborders are sometimes added between order and class or family, respectively.

Order (biology)

One or more orders grouped together, distinguishes differences within a phylum/division.

Class (biology)

One or more phyla/divisions grouped together, distinguishes differences within a domain .

Kingdom (biology)

The highest taxonomic rank widely accepted in biology. 

Domain (biology)

One or more classes grouped together, distinguishes differences within a kingdom.

Called phylum/phyla in zoology and division(s) in botany.

Phylum/Division (biology)

A groups of species that share similarities based on common ancestry. The first part of the name used to classify an organism in the classification system made by Carolus Linnaeus

Genus 

From largest/most general to smallest/most specific:

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

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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

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

Taxon / Taxa

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

Taxonomic hierarchy

The study of identifying and grouping organisms to reconstruct the evolutionary histories of organisms.

Taxonomy in Biology

Wikipedia

Main Taxonomic Ranks in Biology

- The study of the evolutionary history of a certain group of organisms, utilizes taxonomy to show relationships 
- Often represented as a family tree to show which species "yielded" later ones

Phylogeny

- Taxa
- Taxonomic Rank
- Taxonomic hierarchy

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