Words and phrases that rhyme with brightens:  (16 results)
3 syllables:
enlightens, excitons
Words and phrases that almost rhyme :  (4 results)
2 syllables:
bidens, items, lichenes
4 syllables:
budget items
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Adjectives for brightens: hot, light, clear, new, future, much, east, white, fire, delicious, sober, more...

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