This is the 3422nd most frequent German word.
jennifer
"Jennifer" is not a German word; it is a female given name.
Proper noun used as the subject of the sentence.
Jennifer ist meine beste Freundin.
Jennifer is my best friend.
Proper noun used as the direct object of the sentence.
Ich habe Jennifer gestern im Park getroffen.
I met Jennifer yesterday in the park.
Proper noun used as part of a possessive phrase indicating ownership of the birthday party.