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Suffix · forms nouns

-nomy / -omy

a system of laws, rules, or knowledge governing a field; the science or study of the management or ordering of something

In Spanish: -nomía / -omíaScientific

Written by Bryan López, English teacher · Updated June 2026

What this suffix does

-nomy and its variant -omy come from Greek nomos (law, custom, distribution) and form nouns that describe a system of organized knowledge, rules, or management governing a field. Astronomy (the ordering of the stars), economy (the management of a household, extended to state finances), taxonomy (the laws of classification), gastronomy (the art of good eating), autonomy (self-law, self-governance) — each uses the root to describe a coherent system with its own internal logic. These words appear across the sciences, social sciences, arts, and everyday life, making -nomy one of the most productive roots in English.

How it is pronounced

-nomy / -omy

Tap the button to hear how the ending sounds. Each word in the table has its own audio.

Examples

Base word
With -nomy / -omy
In a phrase
  • astroastronomyAstronomy was the first science to produce mathematical predictions that could be precisely tested against observation.
  • taxotaxonomyThe taxonomy of species developed by Linnaeus in the eighteenth century is still the foundation of biological classification.
  • gastrogastronomyThe gastronomy of the region reflected its agricultural history — every dish used what the soil and climate produced most abundantly.
  • autoautonomyEmployees tend to perform better when they are given real autonomy at work.
  • agroagronomyAgronomy applied the findings of chemistry, biology, and meteorology to the practical problem of maximising crop yield.

Common mistakes

-nomy words always describe sciences or academic disciplines
-nomy words describe any coherent system of rules or management, including everyday domains

"Gastronomy" (the art and knowledge of good eating) and "economy" (the management of resources) show that -nomy extends far beyond academic science. "Autonomy" (self-governance) is a philosophical and political concept. The root simply means an organized system of knowledge or management — the domain can be anything from stars to food to governance.

"astronomy" and "astrology" are the same
"astronomy" is the scientific study of celestial bodies; "astrology" is the belief that celestial positions influence human affairs

"Astronomy" uses -nomy (organized scientific knowledge) to describe the rigorous empirical study of stars, planets, and the universe. "Astrology" uses -logy (discourse, study) to describe a belief system that interprets celestial positions as meaningful for human life. They share the "astro-" root but belong to entirely different epistemic categories: one is a science, the other is not.

A trick to remember it

The Greek root "nomos" (law, custom, distribution) is one of the most productive in European languages. A "-nomy" word describes a domain that has its own internal logic, rules, and organizing principles — it is not just a collection of facts but a system. This is why "economy" shifted from meaning "household management" to the management of state resources and eventually to the entire system of production, distribution, and consumption: the same principle of organized, rule-governed management simply expanded its domain.

Practise what you learned

Exercise 1 · Form the word

Fill in: "The ___ of the period was dominated by the question of how to classify the thousands of new species arriving from the tropics." (the science of classification; the ordered system for naming and grouping organisms)

Hint: Taxo (arrangement, order) + nomy (system of laws/knowledge) = the science of classification.

Exercise 2 · Pick the right one

"The region's gastronomy attracted visitors who had not come for the landscape." What does "gastronomy" mean here?

Exercise 3 · Form the word

Fill in: "The province sought greater ___ in managing its own affairs without severing its ties to the central government." (the right and ability to govern oneself; self-determination within a larger structure)

Hint: Auto (self) + nomy (law, governance) = self-law; the right to govern oneself.

Frequently asked questions

What does the suffix -nomy / -omy mean in English?

The suffix -nomy / -omy a system of laws, rules, or knowledge governing a field; the science or study of the management or ordering of something In Spanish it usually maps to -nomía / -omía.

Can you give an example of a word with -nomy / -omy?

"astro" becomes "astronomy". It is a typical example of the -nomy / -omy suffix.

Other useful suffixes

  • -graphy / -graph

    Names recording techniques or disciplines: photo + graphy = photography.

  • -meter

    From Greek "metron" (to measure): names measuring instruments or metric units. Thermometer, kilometer.

  • -ology / -logy

    Names a science or field of study: bio + ology = biology.

Learn every English suffix

-tion, -ness, -ful, -ly, -able... every ending you need to understand thousands of words at once.

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