Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun rainbow

2 senses of rainbow

Sense 1
rainbow -- (an arc of colored light in the sky caused by refraction of the sun's rays by rain)
       => bow, arc -- (something curved in shape)

Sense 2
rainbow -- (an illusory hope; "chasing rainbows")
       => promise, hope -- (grounds for feeling hopeful about the future; "there is little or no promise that he will recover")