This is the -ly and -ily suffix
It is only found at the end of words
When this suffix is added to words ending in ''e we replace the 'e' with -ly (e.g. terrible becomes terribly)
When this suffix is added to words ending in 'y' we replace the 'y' with -ily (e.g happy becomes happily)
Word Lists
-ly (e drop)
comfortably
cuddly
gently
grumbly
horribly
miserably
possibly
probably
simply
sparkly
suitably
terribly
visibly
wriggly
wrinkly
-ily (y drop)
angrily
clumsily
easily
happily
heavily
hungrily
lazily
luckily
merrily
noisily
readily
speedily
steadily
wearily