Prefix + 'loos'
halloos, holloos, hullabaloos, igloos, waterloos,
'loos' + Suffix
loose, loosebox, looseboxes, loosed, looseleaf, looseleafs, loosely, loosen, loosened, loosener, looseners, looseness, loosenesses, loosening, loosens, looser, looses, loosest, loosing,
