a. Advice = counsel / Advices = information
b. Air = atmosphere / Airs = proud
c. Authority = command / Authorities = persons in power
d. Good = wise / Goods = property
e. Iron = metal / Irons = fetters, chains
f. Force = strength / Forces = army
g. Content = satisfaction / Contents = things contained
h. Respect = regards / Respects = compliments
i. Work = job / Works = compositions, factories