NOUNS
smoker
non-smoker
logical
illogical
leading
misleading
willing
unwilling
understanding
misunderstanding
common
uncommon
legible
illegible
valid
invalid
obedience
disobedience
complete
incomplete
certain
uncertain
rational
irrational
sense
nonsense
convenient
inconvenient
curable
incurable
sufficient
insufficient
formation
malformation
moral
immoral
rational
irrational
sane
insane