Work (4)

'work' is the definition.
(an opus is an artistic work)
This is all the clue.
(Other definitions for opus that I've seen before include "Musical piece" , "Showing creative skill" , "Composer's catalogue number" , "Work (mus.)" , "Artistic work" .)
'work' is the definition.
(I know that toil is a type of work)
This is the entire clue.
(Other definitions for toil that I've seen before include "Work hard and long" , "Hard physical work" , "Work really hard" , "Work hard, labour" , "Work incessantly" .)
'work' is the definition.
(I know that work can be written as employment)
This is the entire clue.
(Other definitions for employment that I've seen before include "Utilization" , "The utilisation of something" , "A person's work or profession" , "Paid work" .)
'work' is the definition.
(I know that labour is a type of work)
This is the entire clue.
(Other definitions for labour that I've seen before include "What mothers have been through" , "Agonising time" , "Productive work" , "Hard work, toil" , "Painful time" .)
'work' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for trade that I've seen before include "Personal occupation" , "Transaction" , "Buying/selling of goods" , "Rated (anag.)" , "job" .)
'work' is the definition.
(I know that work can be written as labor)
This is the entire clue.
(Other definitions for ethic that I've seen before include "Principles accepted by a social group" , "Ideology" , "type of behaviour" , "Moral code" , "Moral value" .)