aides-de-camp
beaus-ideal or
beaux-ideal
cartes-blanche
charges-d’affaires
chevaux-de-frise
coups-de-main
courts-martial
cousins-german
daughters-in-law
fathers-in-law
gendarmes or
gens d’armes
jets d’eau
knights-errant
mesdames
men-of-war
messieurs
mothers-in-law
poets-laureate
porte-monnaies
prices-current
sergeants-at-arms
sisters-in-law
sons-in-law
step-children
step-fathers
valets-de-chambre
_Remark I._—If no hyphen is used, the sign of the plural is
always placed at the end; as, spoonful, _spoonfuls_.
_Remark II._—The sign of the possessive case is always placed
at the end of compound nouns; as, _son-in-law’s_ house.