Suffixin (e.g. secret); with (e.g. success)

Na-adjective (keiyodoshi), Nounopposite; reverse; contrary · front and back; parallel to; back to back; adjacent to; inseparable from; inside and out

Godan verb with 'ru' ending, Transitive verbto betray; to turn traitor (to); to double-cross; to go back on; to be unfaithful (to) · to disappoint; to let down

Nounbribe · secret fund; slush fund; money for bribery

Nounbackdoor; rear entrance; rear exit · unauthorized; illicit; illegal

Nounthe reverse (side); back (side); other side; hidden side; behind the scenes

Nounback lane; byway; back street · unfair means; dishonest means

Nounback and front; inside and outside; both sides · inside out (e.g. clothing) · double-dealing; two faces (cf. two-faced)

Nounsomeone working behind-the-scenes; scene shifter · lady consort (to a high personage)

Nounback (side); reverse · B side (of a record) · secret levels; hidden levels; post-game content

Nounreverse side · opposite (of the expected) · purl stitch (knitting)

Nounback gate

Nounback (side); reverse · the inside; background; dark side (e.g. of society); behind the scenes; beneath the surface

Nountreachery; betrayal; perfidy

Nounside street (often parallel to a main street); back street; alley; alleyway

Nouninside out; upside down · flip side; opposite; contrary; reverse

Godan verb with 'su' ending, Transitive verbto turn inside out; to turn the other way; to turn (something) over

Nounsupport (e.g. for an argument); backing; proof; evidence; corroboration; substantiation; guarantee; security

Nounbetrayer; traitor; turncoat; informer

Ichidan verb, Transitive verbto support (a theory, claim, etc.); to back up; to substantiate; to prove

Nounmountain (or hill) behind a house, village, etc. · side of a mountain that gets little sunshine · envious; jealous; jelly

Na-adjective (keiyodoshi), Nounfitting things back to back; agreement of minds

Nounalley house; rear tenement; slum

Nounsecret trick; hidden method; trick of the trade; cheat (in a video game)

Nounneckband lining

Nounsecond crop; interim crop

Noun, Noun which may take the genitive case particle 'no'back (esp. of a building, etc.); rear; behind

Nouninner affection

Nounfalsetto

Nounlining · land that does not adjoin to public or private roads

Nounback street; back alley; slums

Nounrear garden; back yard

Nounnail sticking through

Nounhouse in an alley; rear tenement

Nounroof boards; ceiling · back board (furniture)

Nounsecret name; alias

Nounfleece lining

Nouninformal crest

Nouninside story; the real story (behind something); story not generally known

Noun, Suru verb, Transitive verbendorsement (of a cheque, bill, etc.) · verification of authenticity (written on the back of a scroll); certificate of authenticity · note written on the back of a scroll; comment

NounGleichenia japonica (species of fern with white-backed leaves) · white underside; white bottom; white inner

Nounone's party piece; parlor trick; hidden talent

Nounback leaf

Nounback window; rear window

Nounsecret leader of a group of juvenile delinquents · program in a competing timeslot (programme)

Nounsail with the wind at its back · aback

Nounback cover (e.g. camera, watch, etc.)

Nounbackhand blow; backhand chop; backfist (karate)

Nounsuede; leather using the underside of the skin · piece of leather on the underside of a bag, purse, etc.