Nouns

(n)hack, drudge, hackerone who works hard at boring tasks
(n)drudge, peon, navvy, galley slavea laborer who is obliged to do menial work

Verbs

(v)labor, labour, toil, fag, travail, grind, drudge, dig, moilwork hard“She was digging away at her math homework”, “Lexicographers drudge all day long”