bijou, bijoux, _jewel_, _jewels_.
caillou, cailloux, _pebble_, _pebbles_.
chou, choux, _cabbage_, _cabbages_.
genou, genoux, _knee_, _knees_.
hibou, hiboux, _owl_, _owls_.
joujou, joujoux, _toy_, _toys_.
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6. _Fourth exception._ The seven following, ending in _ail_, change this
into _aux_, as:
bail, baux, _lease_, _leases_.
corail, coraux, _coral_, _corals_.
émail, émaux, _enamel_, _enamels_.
soupirail, soupiraux, _air-hole_, _air-holes_.
travail, travaux, _work_, _works_.
sous-bail, sous-baux, _under-lease_, _under-leases_.
N. B.--Peculiar are bétail, _cattle_, which makes _bestiaux_, and ail,
_garlic_, which makes _aulx_.