be— stands for existing or doing
beneath, bestir, between, beware
bi— stands for two
biblio— about books
bio— about life
biochemistry, biology, biome
by— means near, along, passing through, or done by an agency
─by Words that end in b may be given a ─y suffix. The addition of the —y requires the b to be doubled to preserve the sound of the vowel.
crabby, tabby, hobby, lobby
—able and —ible
Words that end in ─able or ─ible refer to something able to be or fit to be.