WordNet (r) 3.0 (2006):

old woman
    n 1: a woman who is old
    2: herb with greyish leaves found along the east coast of North
       America; used as an ornamental plant [syn: dusty miller,
       beach wormwood, old woman, Artemisia stelleriana]

Moby Thesaurus II by Grady Ward, 1.0:

94 Moby Thesaurus words for "old woman":
   Lord Fauntleroy, Methuselah, Percy, antediluvian, antique,
   back number, beldam, better half, chicken, common-law wife,
   concubine, conservative, cream puff, crone, dad, dame, dodo,
   dowager, effeminate, elder, feme, feme covert, fogy, fossil, frump,
   fud, fuddy-duddy, fuss, fuss-budget, fusser, fusspot, gammer,
   goodwife, goody, goody-goody, grandam, grandma, grandmother,
   grannam, granny, great-grandmother, hag, has-been, helpmate,
   helpmeet, lady, lily, little, longhair, married woman, matriarch,
   matron, mid-Victorian, milksop, mollycoddle, mossback, nance,
   nancy, old battle-ax, old believer, old crock, old dame, old dodo,
   old fogy, old girl, old granny, old lady, old liner, old maid,
   old man, old poop, old trot, old wife, old-timer, pantywaist,
   patriarch, pop, pops, reactionary, regular old fogy, relic, rib,
   sissy, square, squaw, starets, traditionalist, trot, war-horse,
   weak sister, wedded wife, wife, witch, woman