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Showing results for cooperator. Search instead for boomoperatoren.
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 the detective, the cooperator identified Quintero by his legal name, nickname and birth date — even describing a distinctive tribal band tattoo on his arm.

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

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.