justification, necessity, occasion, reason, wherefore,how come
Additional answer
Apart from 'wherefore' and 'how come' these are not synonyms for why, because why is a preposition and the other examples are nouns.
They are synonyms.
Synonyms
Relative and kin are synonyms.
They are synonyms.
synonyms
Are there synonyms for washable
Synonyms for Brake:AnchorBlockConstraintDecelerateDeterrentHaltHindranceObstacleRestraintStop
Synonyms for Brash:ArrogantBoldBrazenCheekyCockyDisrespectfulFlagrantHastyHotheadedImpulsiveMadcapRudeTactlessThoughtlessUntactful
There are no synonyms for pavement.
They are not synonyms.
what is a synonyms for notice
what is the nativeof synonyms