different between workhouse vs workhorse

English

work +? house

workhouse (plural workhouses)

(Britain, historical) An institution for the poor homeless, funded by the local parish where the able-bodied were required to work.
Synonym: poorhouse
(US) A prison in which the sentence includes manual labour.
(archaic) A factory; a place of manufacture.
- 1895, Will H. Glascock, Stories of Columbia (page 190)
  He carefully guarded his secret, but it got out, and, when he had his invention almost completed, some men broke open his workhouse and carried it away. It was afterward returned, but his plan had been copied, and from the copy many machines were made.

work +? horse

workhorse (plural workhorses)

A horse used primarily for manual labor; a draft horse
Synonyms: (Britain, dialectal, one sense) aver, draft horse
(by extension) Anyone or anything that does a lot of work; something or someone who works consistently or regularly.
Those old machines are not very glamorous, but even 20 years after their introduction, they are still the workhorses of the industry.

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