Final answer:
All options a) victor, b) champion, c) prizewinner, and d) title-holder match the word 'winner,' as they all denote someone who has achieved victory in their respective fields.
Step-by-step explanation:
The word winner matches with all of the following options: a) victor, b) champion, c) prizewinner, and d) title-holder. Each of these words are synonyms to 'winner' and characterize someone who has triumphed in a competition or contest. A victor suggests a person who has won a battle or competition. A champion refers to someone who has outranked all rivals in a competition, often in sports or other fields. Prizewinner indicates someone who has won a prize in a competition or lottery. Lastly, title-holder is a term used for someone who holds a championship title in a sport or other competitive activity.