Problem: Sentence1: The reflex motion of his eyebrows revealed his surprise.
Sentence2: He made a motion to adjourn.
Q: Does the term motion mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: The seat of these trousers is almost worn through.
Sentence2: He booked their seats in advance.
Q: Does the term seat mean the same thing in both these sentences?

Answer: different meanings

Problem: Sentence1: Turn on the spot.
Sentence2: The wheels are turning.
Q: Does the term turn mean the same thing in both these sentences?

Answer: the same meaning

Problem: Sentence1: While there's life there's hope.
Sentence2: Having experienced both, the vampire decided that he preferred (un)death to life.
Q: Does the term life mean the same thing in both these sentences?

Answer:
the same meaning