We found one dictionary that defines the word hard workers:

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1. hard workers: Vocabulary.com

(Note: See hard_worker as well.)

Definitions from WordNet (hard worker) ▸ noun:  someone who works as hard as a slave ▸ Also see hard_worker Opposite: lazy, unmotivated, sluggish, indolent, shiftless ▸ Words similar to hard workers ▸ Usage examples for hard workers ▸ Idioms related to hard workers ▸ Wikipedia articles (New!) ▸ Words that often appear near hard workers ▸ Rhymes of hard workers ▸ Invented words related to hard workers