No, many words have no opposite (such as "grass" or "plaster").
Not all words have synonyms and antonyms. "Whose" happens to be one of those words that doesn't have an antonym.
Antonyms
They are antonyms.
Antonyms
Antonyms
Not all words have synonyms and antonyms. "Whose" happens to be one of those words that doesn't have an antonym.
Antonyms
Not all words have well-defined antonyms.
antonyms
antonyms
antonyms
They are antonyms.
Antonyms
Antonyms
No they are antonyms
Antonyms
Antonyms are words that have opposite meanings; typical examples are good and evil, dark and light, out and in, up and down, and so forth. Note that not all words have antonyms.