Validity rhymes with:
solidity, solidity, acidity, fluidity, humidity, liquidity, morbidity, rapidity, rigidity, solidity, superfluidity, timidity, turbidity
Validity sounds like:
valade, valda, valeda, valet, valid, valida, validate, validated, valided, vallette, vallot, valued, vault, vaulted, veiled, veillette, velayati, velda, velotta, velte, viability, villette, violate, violated, violet, violeta, violett, violetta, violette, vivaldi, vlad, vliet, vold, voleta, volt, volta