Stoker
/ˈstəʊkər/
Definition 1 of 2
Pro Tip 1/3Historical Use
Understand that 'stoker' refers to a job common when steam power was used; it's less common now. 
A stoker often worked in harsh conditions to power the steam locomotive.
Pro Tip 2/3Physical Labor
'Stoker' suggests hard physical work, often under extreme temperatures and dirty conditions. 
His grandfather was a stoker, shoveling coal for hours on end.
Pro Tip 3/3Maritime Context
In a maritime context, 'stoker' might convey camaraderie among crew in the engine room. 
The ship stokers would sometimes sing to keep their spirits up.