When looking for rhyming words, go by the sound of each syllable. If one syllable, listen for the major sound you want to re-occur. If more than one syllable, you need to decide which syllable you want to rhyme (first, or last).
Words that rhyme with stuff:
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It isn't a perfect rhyme, in other words, not all the syllables rhyme, but it is close enough to pass as a rhyme.
A potential word that means "ascend" and rhymes with "rhyme" is "climb."
external rhyme
Sufficient or aquedate are two synonyms for enough.
Not good enough