Here are some possible words:
backpack
baldrick
bankbook
bareback
basilisk
beadwork
billhook
Bismarck
blowback
bluebook
bobolink
bodywork
bookmark
bookrack
bootjack
bootlick
bullneck
bushwack
busywork
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern K-SB--. That is, six letter words with 1st letter K and 3rd letter S and 4th letter B. In alphabetical order, they are:
kasbah
An 8 letter word beginning with the letter K is kayaking. Other words include kangaroo, kerosene, kerchief, keckling, keyboard and killings.
Homework is an 8 letter word starting with h and ending with k.
walk, work, week, weak
betaareacodacolacomadatadivagalahulajavalavanovapicapitapumasagatubazona
Sloe.
well you only need one more letter if it's 4 letters and starting with you... try the alphabet
emue
inese Dynasty of 4 letters starting with the letter H?
Anna
amok
Mump.
inch
jazz
Alae
Avid
Quea! Probly
June
buzzzz:)
quos
Nonexistant