Q: Does the word "one" mean the same thing in "He is the best one." and "Driver, noun: one who drives."?

A: the same meaning

Q: Does the word "protection" mean the same thing in "He made trade protection a plank in the party platform." and "Insurance provided protection against loss of wages due to illness."?

A: different meanings

Q: Does the word "think" mean the same thing in "I think he is very smart." and "Think what a scene it must have been!"?

A: different meanings

Q: Does the word "wash" mean the same thing in "My jacket needs a wash." and "I'm going to have a quick wash before coming to bed."?

A:
the same meaning