Final answer:
The word initiate is most similar in meaning to 'begin'. It implies starting something or setting it in motion, while the other options (hassle, repeat, deliver) have different meanings.
Step-by-step explanation:
The word initiate is most similar in meaning to the word begin. When we initiate something, it means we are starting it or setting it into motion, which is essentially what it means to begin. For example, to initiate a project is to begin working on it, or to initiate a conversation is to begin speaking. The word hassle refers to causing inconvenience or bothering someone, repeat means to say or do something again, and deliver means to bring and hand over something. Each of these alternatives has a distinctly different meaning compared to initiate, which shares its core meaning with begin.