below - ad. lower than

best - ad. the most good

betray¹ - v. to turn against; to be false to

better - ad. more good than

between - ad. in the space or time that separates; from one to the other ("talks between two nations")

big - ad. of great size; not small

bill - n. a legislative² proposal³

biology - n. the scientific study of life or living things in all their forms

bird - n. a creature that flies

bite - v. to cut with the teeth

black - ad. dark; having the color like that of the night sky

blame - v. to accuse; to hold responsible

blanket - n. a cloth cover used to keep warm

bleed - v. to lose blood

blind - ad. not able to see

block - v. to stop something from being done; to prevent movement

blood - n. red fluid⁴ in the body

blow - v. to move with force, as in air ("The wind blows.")

blue - ad. having the color like that of a clear sky

boat - n. something built to travel on water that carries people or goods

body - n. all of a person or animal; the remains⁵ of a person or animal

boil - v. to heat a liquid until it becomes very hot

bomb - n. a device⁶ that explodes with great force; v. to attack or destroy with bombs

bone - n. the hard material in the body

book - n. a long written work for reading

border - n. a dividing line between nations

born - v. to come to life; to come into existence

borrow - v. to take as a loan⁷

both - ad. not just one of two, but the two together

bottle - n. a container, usually made of glass, to hold liquid

bottom - ad. the lowest part of something

box - n. something to put things into; a container, usually made of paper or wood

boy - n. a young male person

boycott⁸ - v. to refuse to take part in or deal with

brain - n. the control center of thought, emotions and body activity of all creatures

brave - ad. having no fear

bread - n. a food made from grain

break - v. to divide into parts by force; to destroy

breathe - v. to take air into the body and let it out again

bridge - n. a structure built over a waterway, valley or road so people and vehicles can cross from one side to the other

brief - ad. short; not long

bright - ad. giving much light; strong and clear in color