Regularity rhymes with:
irregularity, irregularity, irregularity, irregularity, popularity, celerity, irregularity, popularity, similarity, celerity, clarity, hilarity, irregularity, polarity, popularity, similarity
irregularity, irregularity, irregularity, irregularity, popularity, celerity, irregularity, popularity, similarity, celerity, clarity, hilarity, irregularity, polarity, popularity, similarity