latchkey

• POS: Noun
• HYPHEN: latch=key

CIDE DICTIONARY

latchkey, n. 

 A key used to raise, or throw back, the latch of a door, esp. a night latch.  [1913 Webster]

OXFORD DICTIONARY

latchkey, n. (pl. -eys) a key of an outer door.

Idiom

latchkey child a child who is alone at home after school until a parent returns from work.

ROGET THESAURUS

latchkey

Instrumentality

N instrumentality, aid, subservience, subserviency, mediation, intervention, medium, intermedium, vehicle, hand, agency, minister, handmaid, midwife, accoucheur, accoucheuse, obstetrician, gobetween, cat's-paw, stepping-stone, opener, key, master key, passkey, latchkey, open sesame, passport, passe-partout, safe-conduct, password, instrument, expedient, means, instrumental, useful, ministerial, subservient, mediatorial, intermediate, intervening, conducive, through, by, per, whereby, thereby, hereby, by the agency of, by dint of, by virtue of, in virtue of, through the medium of, along with, on the shoulders of, by means of, by the aid of, with the aid of, per fas et nefas, by fair means or foul, somehow, somehow or other, by hook or by crook.