Near rhymes (slant rhymes):
* adhesive (similar vowel sound, but different consonant ending)
* inclusive (similar vowel sound, but different consonant ending)
* pensive (similar vowel sound, but different consonant ending)
Eye rhymes (words that look like they rhyme but don't sound alike):
* elosive
* massive
Rhymes using creative license:
* obsessive (forcing a rhyme by emphasizing the "sive" sound)
* expressive (forcing a rhyme by emphasizing the "sive" sound)
Ultimately, the best rhyme for "cohesive" will depend on the specific context and the desired effect.