But-- CONJUNCTION:1. On the contrary: the plan caused not prosperity but ruin. 2. Contrary to expectation; yet: She organized her work but accomplished very little. He is tired but happy. 3. Usage Problem Used to indicate an exception: No one but she saw the prowler. 4. With the exception that; except that. Often used with that: would have joined the band but he couldn't spare the time; would have resisted but that they lacked courage. 5. Informal Without the result that: It never rains but it pours. 6. Informal That. Often used after a negative: There is no doubt but right will prevail. 7. That . . . not. Used after a negative or question: There never is a tax law presented but someone will oppose it. 8. If not; unless: “Ten to one but the police have got them” (Charlotte M. Yonge). 9. Informal Than: They had no sooner arrived but they turned around and left.
And-- CONJUNCTION:1. Together with or along with; in addition to; as well as. Used to connect words, phrases, or clauses that have the same grammatical function in a construction. 2. Added to; plus: Two and two makes four. 3. Used to indicate result: Give the boy a chance, and he might surprise you. 4. Informal To. Used between finite verbs, such as go, come, try, write, or see: try and find it; come and see.