同

riding together; riding with

Nouns which may take the genitive case particle 'no'; Adjectival nouns or quasi-adjectives (keiyodoshi)

the same rank; equality

Grammar

apposition

same kind; same sort; same species; same race; homogeneity

confusion; mixing; merger

association of like-minded people

same level; same extent

companion; comrade; escort; member of a party; fellow traveller; fellow traveler

mutual enemies

same row; same line; same file

same rank; same level; same category; same treatment

person living with a family; lodger

housemate; flatmate; roommate

the same day

next-door neighbors; (living, sitting) next to each other

dōjinshi; magazine published by like-minded people; fanzine; zine

same crime

being equally guilty; bearing the same amount of responsibility

alumni association; graduates' association; alumni meeting; class reunion

same village; same town; same province

pair of lovers; girlfriend and boyfriend

the same person

outrageous; preposterous; scandalous; inexcusable; absurd; execrable

the same as this

mankind; the human creature; fellow creatures

Nouns which may take the genitive case particle 'no'

familiar; well-known; regular (e.g. customer); favourite; favorite

Common noun

old acquaintance; old friend; (a) regular; regular customer

living together; communal life; cohabitation

same year in school