Here's why:
* Perfect rhymes have the same vowel sound and the same ending consonant sounds.
* "Everything" has a unique vowel sound and consonant ending.
However, you could use near rhymes or slant rhymes depending on your needs:
* Near rhymes share similar vowel sounds but have different ending consonant sounds (e.g., "something," "anything," "nothing").
* Slant rhymes share some sounds, but not all (e.g., "covering," "severing").
Ultimately, the best "rhyme" depends on the context and the desired effect.