Agreement vs Treaty

When to use each in English, with meaning, register, and examples.

Agreement

Top 1,000 (very common)B1noun

Treaty

FormalTop 2,000 (common)C1noun
Most formal: TreatyMost common: Agreement
 AgreementTreaty
Pronunciation🇬🇧 /["/əˈɡriːmənt/"]/🇺🇸 /["/əˈɡriːmənt/"]/🇬🇧 /["/ˈtriːti/"]/🇺🇸 /["/ˈtriːti/"]/
MeaningA decision or understanding made by two or more people.An official agreement between countries.
ExampleThe two countries reached an agreement to trade resources.The two countries signed a treaty to end the decades-long conflict.
RegisterNeutralFormal
How commonTop 1,000 (very common)Top 2,000 (common)
CEFR levelB1C1
Part of speechnounnoun
Collocationsdraft, formal, signed, negotiate, work out, conclude, in an/​the agreement, under an/​the agreement, agreement between, breach of agreement, the terms of the agreement, absolute, complete, full, arrive at, come to, reach, by agreement, in agreement, in agreement with, absolute, complete, full, arrive at, come to, reach, by agreement, in agreement, in agreement withglobal, international, regional, draft, draw up, negotiate, come into force, provide for, guarantee something, party, amendment, changes, by treaty, under a/​the treaty, treaty between, an article of a treaty, a clause of a treaty, the provisions of a treaty
Antonymsdisagreement, conflict, dissonanceconflict, war
Common mistakesConfused with 'agreement' as a verb; 'agree' is the correct form., Wrongly uses plural form 'agreements' in contexts that require a singular., Forgets to include 'on' after 'agreement' when talking about specific topics.Confused with 'transaction'., Mistaken as a verb instead of a noun., Using 'treaty' in everyday topics like friendships.
Usage notesUsed when talking about decisions made together. Appropriate in both spoken and written contexts. Avoid in very informal settings where simpler words might suffice.Use in political or legal contexts when discussing agreements between nations. Not suitable for casual conversation or informal contexts.

Frequently asked questions: Agreement vs Treaty

What's the difference between Agreement and Treaty?

Agreement: A decision or understanding made by two or more people. Treaty: An official agreement between countries.

Which is more formal: Agreement and Treaty?

Treaty is the most formal of these.

Which is more common: Agreement and Treaty?

Agreement is the most common in everyday English.

Which is more advanced: Agreement and Treaty?

Treaty is the highest level, at C1, on the CEFR scale.

Are Agreement and Treaty the same CEFR level?

Agreement: B1, Treaty: C1 on the CEFR scale.

What part of speech are Agreement and Treaty?

Agreement: noun, Treaty: noun.

Can you show an example of each?

Agreement: The two countries reached an agreement to trade resources. Treaty: The two countries signed a treaty to end the decades-long conflict.

Can I use Agreement and Treaty interchangeably?

Not always. Agreement and Treaty are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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