The letters contain the 5 letter words stair and brats. The letters also spell the words bait, sat, stab, star, rat and tar.
Certainty.
One word containing the letters -bine is combine.
architectural
candidate
chubby
"MINNOW"
Unless there is a five letter variation, then: "backed". If you don't included modification by tense, then... perhaps it is... debacle.
everywhere
noticed
paucity
ceviche
Those six letters are "amount."