Copulate is a verb that describes the act of sexual intercourse. However, there are several other words that can be used to express the same meaning in a more polite or euphemistic way. For instance, the word "mate" carries almost the same meaning as copulate, making it a discreet alternative. The words "make love" and "have sex" may also be used as synonyms for copulate in a more romantic or casual setting. On the other hand, words like "fuck" and "screw," while more vulgar, are still considered synonyms of copulate. Overall, the choice of words to describe an intimate act relies on the context and the audience.