Difference between Superfluous and Extra

SUPERFLUOUS vs EXTRA: NOUN

A supernumerary or walk-on in a film or play
An extra edition of a newspaper, which is printed outside of the normal printing cycle
A run scored without the ball having hit the striker's bat - a wide, bye, leg bye or no ball; in Australia referred to as a sundry
Something of an extra quality or grade.
A run, as from a bye, credited to the general score but not made from a hit.
An edition of a newspaper issued at a time other than the regular one.
In cricket, a score or run not made from the bat, as a bye or a wide: usually in plural.
Something in addition to what is usual or expected; something over and above the usual course or charge, or beyond what is usual.
A performer hired to play a minor part, as in a crowd scene in a film.
A special edition of a newspaper.
Something additional of the same kind
An additional edition of a newspaper (usually to report a crisis)
A minor actor in crowd scenes
Something, such as an accessory on a motor vehicle, for which an additional charge is made.
Something more than is usual or necessary.
Specifically An edition or a copy of a newspaper issued at an unusual hour to convey special intelligence.

Serving no useful purpose; having no excuse for being
In excess of what is required or sufficient.
An interval that exceeds a major or perfect interval by a semitone.
More than is wanted or is sufficient; rendered unnecessary by superabundance; unnecessary; useless; excessive.
Being beyond what is required or sufficient.
More than is needed, desired, or required

More than is needed, desired, or required
Further or added
Added to a regular schedule
More than or beyond what is usual, normal, expected, or necessary: : superfluous.
Extraordinarily good; superior; as extra work, extra pay.
Beyond what is due, usual, expected, or necessary; additional; supernumerary; also, extraordinarily good; superior
Subject to an additional charge.

More than is wanted or sufficient; unnecessary from being in excess of what is needed; excessive; redundant; needless: as, a composition abounding with superfluous words.
Supplied with superfluities; having somewhat beyond necessaries.
Doing more than what is called for; supererogatory.
Excessive.
In music, of intervals, augmented.
Serving no useful purpose
Having no excuse for being

Used in trade to denote a size somewhat larger than that, mentioned: as, extra elephant folio; extra foolscap octavo.
A prefix of Latin origin, originally an adverb and preposition, meaning ‘outside, beyond.’ ;
Beyond the ordinary standard or measure; extraordinarily; unusually; uncommonly: as, this is done extra well; that is an extra high price.
More than what is usual, or than what is due, appointed, or expected; supplementary; additional; supernumerary: as, an extra price; an extra edition of a newspaper; extra diet; extra charges at a boarding-school.

Extraneous, Useless, Surplus, Excess, Spare, Supernumerary, Extra, Supererogatory, Wasted, Worthless, Unneeded, Redundant, Otiose, Unnecessary, Pointless

Supernumerary, Surplus, Other, Duplicate, Redundant, Outside, Unscheduled, Superfluous, Unneeded, Added, Unnecessary, Excess, Special, Spare, Additional

Extraneous, Useless, Surplus, Excess, Spare, Supernumerary, Extra, Supererogatory, Wasted, Worthless, Unneeded, Redundant, Otiose, Unnecessary, Pointless

Supernumerary, Surplus, Other, Duplicate, Redundant, Outside, Unscheduled, Superfluous, Unneeded, Added, Unnecessary, Excess, Special, Spare, Additional

Superfluous copies should not be made or kept.
SUBMERGED BALLAST PUMPS make the pump room superfluous.
This description, of course, made the section superfluous.
First, a statute cannot be interpreted as superfluous.
Spot superfluous adjectives, weak verbs, and unwanted repetitions.
What a superfluous use of time and money.
It would be superfluous to multiply these examples.
These are not superfluous decorations or lifestyle choices.
Internal Revenue Service Omit superfluous words Words are superfluous when they can be replaced with fewer words that mean the same thing.
And to the believer it must be superfluous, if true notices of Christ are superfluous to believers.

COLLEGE EXTRA OFFER: To receive ESPN College Extra, customer must subscribe to a commercial base programming package.
Taking extra classes is best avoided because it may delay your graduation date, not to mention the obvious financial burden of the extra fees.
This is an extra activity that is now added in GTA San Andreas to make extra income for the player.
Although most people will only consider investing in a traditional visa, this could take some extra time and sometimes extra money to obtain.
But if you want to shrink your debt faster, you can make larger extra payments or extra ones.
Avoid waiting by the mailbox, making extra trips, and paying extra fees just so you can cash or deposit your tax refund.
It also has an extra wooden tray that slides out from underneath to give us extra space for meal prep.
Go the extra mile by having his gift personalized making it extra special for him.
Note that the extra level of indirection involves an extra memory allocation.
We paid extra for extra leg room and reclining seats.