Q: Does the word "keep" mean the same thing in "Keep open the possibility of a merger." and "Keep my seat, please."?

A: the same meaning

Q: Does the word "job" mean the same thing in "He gave it up as a bad job." and "She did an outstanding job as Ophelia."?

A: the same meaning

Q: Does the word "head" mean the same thing in "Be careful when you pet that dog on the head; it may bite." and "We will consider performance issues under the head of future improvements."?

A: different meanings

Q: Does the word "freeze" mean the same thing in "Don't go outside wearing just a t-shirt; you'll freeze!" and "Freeze the leftover food."?

A:
different meanings