decisive resource (noun) ace in the hole: hidden advantage
Sinonime: bedmate, best girl, chatelaine,
concubine, courtesan, doxy, dream girl, fancy woman,
girlfriend,
inamorata, kept woman, ladylove, main squeeze, moll, old lady, other woman,
paramour,
prostitute, roommate, shack, shack job,
sugar,
sweetheart, sweetie