another word for the word suffice is- be enough
Perhaps the word you are looking for is "confident". That is a word which means being so sure you know how to spell a word you don't bother looking it up.
another word for explain is justify.
Good
wedge
Bother, annoy, and disturb are words. Those mean agitate.
bother
sib
Disturb
Jeer, bother, mess with
Another word that means the same as trust is belief. Also reliance.
ado
bother (Don't worry...don't bother yourself about it...)
Illinois.
IrritatingAgitatingDisturbingBothersomeTroublesomePesteringVexatious
double trouble
to mess around with or bother or play with