Rules for Near Rhymes

I seem to be confused about the rules for near rhymes. Specifically are 'slate' and 'pursuit' near rhymes? They seem to me to be so (the vowel sound is different) yet all the references I've checked don't crosslink the two.


Even though the consonant sounds are the same, the vowel sounds are quite different. The vowel sound in "slate" is a rising diphthong, while the vowel sound in pursuit is a falling diphthong. A smaller difference in sound would be needed to class them as near rhymes.