Software's rhymes with:
delaware's, housewares, somewheres, airfares, americares, armchairs, backstairs, bankshares, daycares, delaware's, fiduciares, forebears, healthcare's, housewares, legionnaire's, legionnaires, markair's, medicare's, nightmares, somewheres, tenncare's, thoroughfares, wheelchairs
Software's sounds like:
saboteurs, spadework, spatters, speeders, spiders, spotters, sputters