Q: Does the word "movement" mean the same thing in "Politicians have to respect a mass movement." and "Movement is a sign of life."?

A: different meanings

Q: Does the word "reaction" mean the same thing in "In this reaction, the acid and base will neutralize each other, producing a salt." and "The announcement of the verdict brought a violent reaction."?

A: different meanings

Q: Does the word "mount" mean the same thing in "Mount a horse." and "The rider mounted his horse."?

A: the same meaning

Q: Does the word "cover" mean the same thing in "The grant doesn't cover my salary." and "The President covered the fact that he bugged the offices in the White House."?

A:
different meanings