Legionnaires rhymes with:
legionnaire's, legionnaire's, legionnaire's, legionnaire's, legionnaire's, airfares, americares, armchairs, backstairs, bankshares, daycares, delaware's, fiduciares, forebears, healthcare's, housewares, legionnaire's, markair's, medicare's, nightmares, software's, somewheres, tenncare's, thoroughfares, wheelchairs
Legionnaires sounds like:
legionaries, legionnaire's, lexmark