Taxonomy vs Unnecessity - What's the difference?

taxonomy | unnecessity |

As nouns the difference between taxonomy and unnecessity

is that taxonomy is the science or the technique used to make a classification while unnecessity is (lb) needlessness.

Unnecessity vs Needlessness - What's the difference?

unnecessity | needlessness | Synonyms |

Unnecessity is a synonym of needlessness.

As nouns the difference between unnecessity and needlessness

is that unnecessity is (lb) needlessness while needlessness is the state or characteristic of being needless.