Examples of eight letter nouns that start with 'B' and end with 'K' are:
libretti
8 letter words beginning with B and ending with T: * backtalk * bankrupt * basement * besought * bookrest * bouffant * braggart * breakout
slippers, scissors
destatus
undercutunionistuppercut
Sunrisesspaciousstudioussensuoussonorousscissorssleeplessstraplessshiftlessshirtlessshinglessightlesssalacious
One example of an 8-letter word ending with "ing" is "starting." It refers to the act of beginning something or initiating a process.
Charisma, chickpea, Casanova, Canberra
headache. Here's one with 9 letters - heartache
trickier
ballista babushka bandanna bromelia bronchia Bulgaria
Inchworm - A small hairless caterpillar