This is the 3784th most frequent French word.
sullivan
"Sullivan" is not a French word; it is an English surname often used as a proper noun.
The usage of 'Sullivan' in this sentence is as a proper noun indicating the name of a person.
Sullivan joue au tennis tous les week-ends.
Sullivan plays tennis every weekend.
Here, 'Sullivan' refers to the name of a method, likely named after its creator or proponent, acting as a proper noun in the context of an educational method.
La méthode Sullivan est utilisée pour enseigner aux étudiants.
The Sullivan method is used to teach students.
In this sentence, 'Sullivan' is part of the name of a café, acting as a proper noun to identify a specific place.