What is the definition of an antagonist and a protagonist?

Which of the following sets of words are true rhymes? height and weightink and pinkcat and hatlove and love

Can you describe the word chalk without saying the words chalk or chalky? (type your own definition of the word.)

“generally, however, the term robot refers to any machine that is able to perform a complex task on its own, but whose actions or tasks are controlled by human programming.”