Honey is a boon to those with weak digestion.
I have one more boon to claim from you, he whispered.
Movie stardom can be a big boon, for example.
It is an unspeakable boon to me to be able to speak in winged words that need no interpretation.
Batter Blaster is a boon for dads who are short on time, but have hungry kids at the table on a Saturday morning.