pizza
The French word for pizza is the same as the English word. It is used to refer to the popular Italian dish made with a round, flat base of dough baked with a topping of tomato sauce and cheese, typically with added meat or vegetables.
I like to eat pizza
This is a simple statement of preference. The verb 'aimer' (to like) is followed by the infinitive verb 'manger' (to eat) and then followed by the food item 'la pizza'. In French, when speaking of food in general, it is common to use the definite article 'la' or 'le' before the noun.
The pizza is delicious
This is a simple declarative sentence. It consists of the subject 'la pizza', the verb 'est' (is), and the adjective 'délicieuse' (delicious). Note that adjectives often come after the noun in French, unlike in English.
We are ordering a pizza tonight
This is a statement of intent. The verb 'commander' (to order) is conjugated in the first person plural 'nous' form, followed by the indefinite article 'une' and the noun 'pizza'. The phrase 'ce soir' establishes the time for the activity.