Better letter.
If it were a Hink-Pink, it could be "a thick brick." Actually, the question is about Hink-Pink according to the original source for the question which is a book for gifted students. The section of the book asks about both hink pink and hinky pinky, and the question is in the hink-pink category on the page.
swift lift
strange change
Fine Nine.
heart art
better letter
Better letter
Fake bake is a Hink-Pink for counterfeit cook.
The Hink Pink for a holiday donkey is a Yule mule.
Thin inn is the hink pink for skinny hotel.
The hink pink for "boy's test" is "lad's quiz."
Dark ark is a Hink-Pink for Noah's boat with the lights off.
"Man pan" is a hink pink for male pot or masculine skillet.
lathering gathering is the hink pink for a group of men shaving
pink mink
A hink-pink for "incorrect melody" would be wrong song.
The hink pink is clean teen.