Words and phrases that rhyme with guesstimate:  (3 results)
3 syllables:
estimate
4 syllables:
misestimate
5 syllables:
underestimate
Words and phrases that almost rhyme :  (15 results)
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Adjectives for guesstimate: best, rough, reasonable, good, initial, conservative, own, accurate, eyeball, pure, able, more...

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