shorter shortest
smaller smallest
later latest
happier happiest
slower slowest
newer newest
redder reddest
thinner thinnest
dirtier dirties
busier busiest
older/elder oldest/eldest
younger youngest
stronger strongest
rounder roundest
hotter hottest
fatter fattest
higher highest
wider widest
clearer clearest
faster fastest
quicker quickest
nicer nicest
safer safest