Double consonants/vowel blends/aw/ou/aug/oug. The spelling patterns will help you remember how the words is spelled.
footprint
fairground
although
allowance
appoint
laughter
bleachers
laundromat
encounter
bountiful
entertainment
flawlessly
lawyer
applause
faucet
caution
boundary
doubting
southern
roughness
grouchiness
distraught
dialect
pioneers
ruined