Basic Words (just add -er)
bright
cold
dark
fast
high
light
long
loud
low
old
quiet
rough
sharp
short
smart
smooth
strong
sweet
thick
tight
weak
young

Words Ending in ‘e’ (drop the ‘e’ and add -er)
brave
crude
cute
fine
huge
large
late
nice
rude
safe
simple
wide

Words Ending in Single Vowel +
Consonant (Except ‘y’) (double the final consonant and add -er)
big
dim
fat
fit
glum
grim
hot
mad
red
sad
thin
wet

Words Ending in Consonant + ‘y’ (drop the ‘y’ and add -ier)
crazy
early
easy
fluffy
friendly
furry
happy
heavy
jolly
lazy
lucky
nasty
noisy
pretty
scary
silly
tiny
windy