Two words pulling in opposite directions
An antonym is a word with an opposite meaning to another word. Merriam-Webster gives hot and cold as an example. If one character wants the soup hot and another wants it cold, they are asking for opposite things.
Other everyday pairs include early and late, or wide and narrow. The words describe contrasting ends of the same idea: time, width or temperature.
Simply choosing something different is not enough. A spoon is different from soup, but it is not soup’s opposite.
Why light can have two different opposites
Imagine a feather beside a stone. You might describe the feather as light and the stone as heavy. Here, the contrast concerns weight.
Now imagine choosing between a light blue paint and a dark blue paint. Light and dark contrast in colour instead. The word has changed its job, so its opposite changes too.
The dictionary lists both the weight and colour meanings of light. Before choosing an antonym, ask which meaning the sentence uses. Painting a wall “heavy blue” would give your decorator a puzzle.
Antonyms and synonyms do different jobs
Antonyms point towards opposite meanings. Synonyms have the same or nearly the same meaning in a particular use. Merriam-Webster gives small and little as synonyms.
Compare a small box with a little box: the meaning stays close. Change small to big and you have moved in the opposite direction.
Context still matters. Not every synonym fits every sentence, and not every word needs a neat opposite. When a word puzzle asks for a link, read the whole clue before reaching for the first familiar pair.
For a stranger twist, meet contronyms: one word with opposing meanings. Or switch from meaning to sound with flour and flower.