Boston has 23 official neighborhoods:
Charlestown: Across the Charles River with Bunker Hill monument
East Boston: Across the harbor with the airport
Brighton: Area along Comm Ave towards BC
Allston: BU and area across the Charles from Harvard
Fenway/Kenmore: Area around Fenway Park and Gardner/MFA
Back Bay: All the perfectly straight roads around Newbury & Copley
Beacon Hill: Narrow hilly roads around the State Capitol
West End: Mostly gone now. TD Garden and MGH
North End: Little Italy
Downtown: its downtown
Chinatown; its Chinatown and around South Station
Bay Village: Tiny little neighborhood just West of the Shubert and Wang theatres
South End: The Philly style row houses across the Mass Pike from Downtown
South Boston (Southie): all of the super dense houses in the old Irish area East of I-93....also Seaport
Mission Hill: The area around all the Longwood hospitals
Roxbury: Primarily black neighborhood south of BMC
Mid Dorchester: Upper half of Dorchester (mostly minority neighborhoods north and West of the Red Line)
Dorchester: Lower Half of Dorchester (Mostly white neighborhoods south and East of the Red Line)....Dorchester is split for planning purposes because its so big
Jamaica Plain: Hipsters west of the Orange Line
Mattapan: Largely black neighborhood at the south end of Blue Hill Ave
Roslindale: Extremely diverse suburb
Hyde Park: Slightly less diverse suburb
West Roxbury: Decidedly undiverse suburb

https://theculturetrip.com/north-america/usa/massachusetts/boston/articles/a-guide-to-bostons-23-neighborhoods/