i Register
In some senses, aught is marked as archaic, obsolete, rare. Watch for register when choosing this word.
pron
Anything whatsoever, any part.
for aught I know/care
[…] wouldst thou aught with me?
adv
At all, in any degree, in any respect.
[…] and if your love Can labour aught in sad invention, Hang her an epitaph upon her tomb, And sing it to her bones [...]
noun
Whit, the smallest part, iota.