Difference between Former and Once

FORMER vs ONCE: NOUN

One who forms, fashions, creates, or makes; a creator.
Specifically, a pattern in or upon which anything is shaped, as a piece of wood used for shaping cartridges and gun-wads; any mechanism contributing to give shape to an article in process of manufacture.
The first of two or the first mentioned of two
A predecessor.
One of a number of appliances and machines used in bending and shaping sheet-metal into tubes, cylinders, boxes, and other forms.
The templet used for the cutting of gear-teeth; the guide used for giving desired motion to the cutter when forming or cutting irregularly shaped pieces in a profiling-machine.
One who forms; a maker; a creator.
A shape around which an article is to be shaped, molded, woven wrapped, pasted, or otherwise constructed.
A templet, pattern, or gauge by which an article is shaped.
A cutting die.
Someone who forms something.
An object used to form something.
Someone in, or of, a certain form (class).
In electricity, a frame upon which the coils of certain types of armatures and transformers are wound.

Belonging to the distant past
Referring to the first of two things or persons mentioned (or the earlier one or ones of several)
Belonging to some prior time
First of aforementioned two items. Used with the, often without a noun.
Previous
Earlier, as between two things mentioned together; first mentioned.
Near the beginning; preceeding.
Preceding in order of time; antecedent; previous; prior; earlier; hence, ancient; long past.
(used especially of persons) of the immediate past

At some one period of time; -- used indefinitely.
At any one time; -- often nearly equivalent to ever, if ever, or whenever.
At one and the same time; simultaneously; in one body.
Once and once more; repeatedly.
On one occasion
At a previous time
As soon as
One time only.
At one time in the past; formerly.
At any time; ever.
By one degree of relationship.
One and only one time.
Formerly; during some period in the past.
Multiplied by one: indicating that a number is multiplied by one
For one time; by limitation to the number one; not twice nor any number of times more than one.

I prefer the former version to the latter one"
Bygone.
Preceding or going before in a series; antecedent in order of thought, of action, etc.: specifically applied to the antecedent one of two things, or of two parts or divisions of anything.
Past; especially, long past; ancient.
Being or happening before in time; preceding another or something else in order of time; prior.
Being before in place; fore; first; foremost.

One time.
One and the same time: usually with at: as, they all cried out at once. See phrases below.
At some future time; some time or other.
At any time; in any contingency; on any occasion; under any circumstances; ever.
Without delay; immediately: often merely expletive: as, John, come here once.
Once for all.
Immediately; forthwith; without delay.
When at any time; whenever; as soon as.
(idiom) (once more/again) As usual; in typical fashion.
(idiom) (once more/again) Another time; again.
(idiom) (at once) All at one time; simultaneously.
(idiom) (at once) Immediately; instantly.

Defunct, Deposed, Veteran, Ousted, Retired, Sometime, Early, Other, Past, Late, Once, Previous, Quondam, Erstwhile, Onetime

Finally, Then, Never, Again, In one case, At one time, One time, Quondam, Former, Formerly, Erstwhile, Onetime, Sometime, Past, When

Defunct, Deposed, Veteran, Ousted, Retired, Sometime, Early, Other, Past, Late, Once, Previous, Quondam, Erstwhile, Onetime

Eventually, Twice, Then, Never, Again, At one time, One time, Quondam, Former, Formerly, Erstwhile, Onetime, Sometime, Past, When

Law is a former student leader in the democratic movement in Hong Kong and a former lawmaker, now exiled in London.
Yoweri Museveni and his wife Janet, Burundi president Pierre Nkurunziza, former Nigerian president Olusegun Obasanjo and former Mozambican president Joaquim Chissano.
President Joe Biden saluted former President Jimmy Carter during his inaugural address, saying he spoke to the former president on Tuesday night.
Information on former fellows obtained from former fellows.
The amendment prohibited former Confederate states from repaying war debts and compensating former slave owners for the emancipation of their enslaved people.
Former President Barack Obama speaks at a rally as he campaigns for Democratic presidential candidate former Vice President Joe Biden, Monday, Nov.
Former TDCJ Employee to request that the former employee be added.
Former President Barack Obama and former First Lady Michelle Obama this.
For example, a number of such leaders can be identified, including former Senator Sam Ervin and former Representative Robert Kastenmeier.
Former name or former address, if changed since last report.

In grief, the two are connected once more.
Also, if the outcome is the same whether a transaction is performed once or more than once, thenrecovery from catastrophic failure can be simplified.
Once you reacquire your Philippine citizenship, you will once again enjoy full civil, economic and political rights under existing Philippine laws.
It seems crazy that you have to pay twice: once for your primary application and once again for your secondary applications.
Since birth and heaven and earth, all three do meet In thee at once, which thou at once wouldst lose?
We do NOT want to validate more than once, or submit more than once.
Once a move is made, staff maintain contact with the client once a month for three months, and then annually thereafter.
This means that any employer processes involved must be run more than once a year and potentially once for each specific employee due date.
Once the constitution is amended once, such a coalition is identified and subsequent amendments are easier to promulgate.
She says he kissed her once in his bedroom and once by the pool at a local country club.