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Definitions

cooperator

[koh-ahp-uh-rayt-er] / koʊˈɑp əˌreɪt ər /

NOUN

abettor

Synonyms

STRONG

accessory accomplice confederate helper second supporter

WEAK

co-conspirator partner in crime

Antonyms

STRONG

adversary opponent

NOUN

assistant

Synonyms

STRONGEST

aide apprentice associate attendant backup colleague companion deputy friend partner representative secretary

STRONG

abettor accessory accomplice adherent adjunct ally appointee auxiliary backer coadjutor collaborator confederate flunky follower gofer help helpmate mate patron peon subordinate supporter temp

WEAK

coadjutant fellow worker right-hand person squire temporary worker

Antonyms

STRONGEST

antagonist boss detractor enemy foe manager opponent stranger

STRONG

adversary leader

NOUN

associate

Synonyms

STRONGEST

accomplice ally assistant buddy co-worker cohort collaborator companion comrade crony fellow friend partner

STRONG

accessory affiliate aid auxiliary branch chum compatriot confederate consort helper joiner mate offshoot pal peer playmate sidekick

WEAK

clubber kissing cousin one of the folks pard

Antonyms

STRONGEST

enemy foe opponent

WEAK

antagonist competitor rival stranger

NOUN

lieutenant

Synonyms

STRONG

abettor accessory accomplice adherent adjunct adjutant aide ally appointee apprentice associate attendant auxiliary backer backup coadjutor collaborator colleague companion confederate deputy flunky follower friend gofer help helper helpmate mate partner patron peon representative second secretary subordinate supporter temp

WEAK

coadjutant fellow worker right-hand person temporary worker

Antonyms

STRONG

adversary antagonist boss chief detractor enemy foe leader manager opponent opposer stranger superior

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

They’ve got one cooperator, but you can cross-examine the cooperator, who’s cooperating in hopes of a more lenient sentence.

From Slate • Jan. 7, 2026

According to Del Rio, the cooperator said he’d met Quintero through a “prison contact.”

From Los Angeles Times • Oct. 10, 2025

"He is not a viable cooperator for the Fulton County D.A.,"

From Salon • Feb. 27, 2024

While Wang is the first cooperator to take the stand, jurors have so far heard from three other witnesses.

From Reuters • Oct. 6, 2023

Auxiliary -- N. auxiliary; recruit; assistant; adjuvant, adjutant; ayudante†, coaid†; adjunct; help, helper, help mate, helping hand; midwife; colleague, partner, mate, confrere, cooperator; coadjutor, coadjutrix†; collaborator. ally; friend &c.

From Roget's Thesaurus of English Words and Phrases by Roget, Peter Mark

cooperator

Example Sentences

Related Words