trouble vs elbow grease

trouble and elbow grease both are nouns.

Word	Noun	Adjective	Verb	Adverb
trouble	Yes	No	Yes	No
elbow grease	Yes	No	No	No

As nouns, elbow grease is a hypernym of trouble; that is, elbow grease is a word with a broader meaning than trouble:

Other hypernyms of trouble include effort, exertion, sweat, travail.

trouble (noun)	elbow grease (noun)
an effort that is inconvenient	use of physical or mental energy; hard work
a source of difficulty
an event causing distress or pain
an angry disturbance
a strong feeling of anxiety
an unwanted pregnancy

trouble (verb)	elbow grease (verb)
cause bodily suffering to and make sick or indisposed
disturb in mind or make uneasy or cause to be worried or alarmed
move deeply
to cause inconvenience or discomfort to
take the trouble to do something; concern oneself