This is the 3884th most frequent Russian word.
бостона
"Бостона" is the genitive singular or accusative plural form of "бостон," which can refer to a type of fabric, or it may mean "of Boston" in certain contexts.
Here 'Бостона' is in its genitive form, indicating possession or association.
Я впервые услышал джазовую музыку в Бостоне.
I first heard jazz music in Boston.
In this case, 'Бостона' is the genitive form, used after the preposition about a subject.
Мы обсуждали историю Бостона на лекции.
We discussed the history of Boston in the lecture.
Here 'Бостона' denotes relation to a specific place, used with 'для' (for).