coffee beans
seeds from a coffee bush (which are ground or crushed to make coffee grinds which are used to make the drink coffee)

white coffee
coffee with milk

black coffee
coffee without milk

skinny coffee
coffee with skimmed (or low-fat) milk

espresso
a small measure of strong, dark coffee

latte
one measure of espresso and milk

cappuccino
one measure of espresso and hot, frothy milk (milk which is whipped until it forms lots of tiny bubbles) and often powdered chocolate on the top

filter coffee
coffee made by slowly pouring boiling water through crushed coffee beans in a coffee filter (thin paper which allows only the liquid to flow through, not the beans or the powder)

instant coffee
coffee made by adding boiling water to coffee powder (it is made very quickly because you don't need to filter the coffee)

caffeine (uncountable)
a chemical, found in coffee (and tea), which is a stimulant (something which makes people more active)

decaffeinated coffee / decaf coffee
coffee that has been treated so that the caffeine (a chemical substance in coffee or tea) has been removed

strong / weak
two adjectives used to describe coffee with a full flavour / lacking in flavour