English Reference

Word

powerhouse

Phoneticspow·er·house, stress on the first syllable

US/ˈpaʊɝˌhaʊs/

UK/pˈaʊəhˌaʊs/

Definitions

01influential person or group

B2 · Upper Intermediate Countable noun

n. a person, team, or company that is very successful and has a lot of power or influence.

n. a person or organization possessing great energy, strength, or influence within a particular field.

“The small tech startup quickly grew into a global powerhouse in the industry.”

“By investing heavily in research and development, the nation established itself as an economic powerhouse within the region.”

Synonyms

Antonyms

weaklingunderdog

02source of energy

C1 · Advanced Countable noun Science Technical

n. a building where electricity is produced, or the part of a machine that provides the power.

n. a building where electrical power is generated; literally, a power station.

“The old powerhouse by the river was converted into a modern art gallery.”

“Engineers inspected the powerhouse to ensure the turbines were capable of meeting the city's increased energy demands during the winter.”

Synonyms

power stationgenerator

03strong hand of cards

C2 · Proficiency Countable noun Informal · Slang

n. a very strong set of cards in a game that is likely to win.

n. a hand of cards possessing high point value or strategic strength, making a win highly probable.

“He looked at his cards and realized he was holding a real powerhouse.”

“Despite holding a powerhouse of a hand, the player remained stoic to avoid alerting his opponents to his advantage.”

Synonyms

winning hand

Real-World Examples

“Limina was written in 2023 for the pianist Eliza McCarthy , who is a powerhouse soloist here with the National Symphony Orchestra Ireland and conductor Ryan McAdams .”
The Guardian 28 Aug 2026
“This option was a moisture powerhouse for our testers, with the majority of the group rating it as fast-absorbing and hydrating for over 12 hours.”
The Guardian 29 Aug 2026

Etymology

From power + house.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Word family

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B2 FirstIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.5.5–6.5TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 4.0–4.572–94TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.785–944
Frequency
Frequent
Level
B2 · Upper Intermediate
Updated

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English Reference