The word "omission" refers to something that has been left out or excluded. It can apply to information, details, or elements that are intentionally or unintentionally not included in a particular context. Omission often implies that the absence of the item can impact understanding or completeness.
Fiction
Adundance is not a word. Abundance, which you may mean, is a word. It means there is a lot of something. It means there is plenty of something.
Portion?
That it is valuable
fact..................
"Observed" is a word that means something has been noticed.
A word meaning left out that starts with O is omitted.
The word you're looking for is "omitted."
Insertion means that something has been inserted or the act of inserting something. The word insertion is of Latin origin.
Fiction
The word you are looking for is "retract." It means to withdraw or take back a statement or allegation that has been made.
It means adjusted to the change something has been introduced too.
It means to mention and talk about something. It also means to have been recommended by someone else.
secular
As a verb the word "wreck" means to destroy or damage something. As a noun, the word refers to something that has been so severely damaged as not to be worth repairing.
The word "accomplishing" means to successfully complete a task or goal. It implies that something has been achieved or fulfilled.
The word "ash" can be a noun or a verb. As a noun, it refers to the powdery residue left after something is burned. As a verb, it means to turn something into ash through burning.