Problem: Sentence1: He sacrificed a piece to get a strategic advantage.
Sentence2: He needed a piece of granite.
Q: Does the term piece mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: Hardly enough elbow room to turn around.
Sentence2: There wasn't that much elbow room in the aircraft.
Q: Does the term room mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: He stuck his head out the window.
Sentence2: Be careful when you pet that dog on the head; it may bite.
Q: Does the term head mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: It is always a job to contact him.
Sentence2: Estimates of the city's loss on that job ranged as high as a million dollars.
Q: Does the term job mean the same thing in both these sentences?

Answer:
different meanings