root, source, origin

truth, reality, actuality

main island

head office, main office, main store

this land, our country

bookshelves, bookshelf, bookcase

main topic, main subject, main issue

main body (of troops), main force

substance, true form, true character

principal object of worship (at a Buddhist temple), principal image

main line, trunk line

one's registered domicile (as recorded in the family register), one's legal domicile (as opposed to where one lives)

registered domicile, legal domicile

rare book, uncommon book

genuine article, real thing

book, origin

Japanese language, Japanese

Japan, Nippon