stronghold; base; headquarters
Refers to a main base of operations, especially for military forces, organizations, or sports teams. Often implies a secure or central location.
A plan was made to attack the enemy's stronghold.
The team's home base is the Tokyo Dome.
The company has its headquarters based in Osaka.
The team moved its home base to Tokyo.
This unit has Hokkaido as its base of operations.
拠点 refers to any base or foothold an organization has, not necessarily the primary one, whereas 本拠地 specifically means the main base.
根拠地 is nearly identical to 本拠地 in meaning but sounds slightly more literary or military, while 本拠地 is the more common everyday word.
基地 usually refers to a physical military or scientific facility (e.g. a base of operations), while 本拠地 can be used more broadly for any organization's main base, including sports teams.
本籍地 refers to one's legal registered domicile, while 本拠地 means an organization's main operating base; the two share the 本...地 pattern but differ completely in meaning.
Compound of 本 (main) + 拠 (base, foothold) + 地 (place). The kanji 拠 is used in words related to bases or strongholds, such as 拠点 (base) and 根拠 (grounds).