1) Any hard worker 2) Cog in the work force 3) Drudge 4) Field worker 5) Hard worker 6) One slaving away 7) One sweating it out 8) One who works strenuously 9) Peon 10) Serf 11) Slave 12) Tillie of 1920s comics 13) Tillie of comics 14) Tillie of old comics 15) Tillie of the comics 16) Tillie was one 1) Peon 2) Serf 
• (n.) One who toils, or labors painfully.
Toil'er noun One who toils, or labors painfully. 
[n] - one who works strenuously
noun one who works strenuously