Difference between Lengthen and Extend

LENGTHEN vs EXTEND: VERB

Open or straighten out; unbend
Expand the influence of
Prolong the time allowed for payment of
Reach outward in space
Make available; provide
To cause to increase in extent.
To cause to last for a longer period of time.
Increase in quantity or bulk by adding a cheaper substance
To straighten (a limb).
Continue or extend
Offer verbally
Span an interval of distance, space or time
Extend one's limbs or muscles, or the entire body
Cause to move at full gallop
Lengthen in time; cause to be or last longer
Extend in scope or range or area
Extend or stretch out to a greater or the full length
Thrust or extend out
Stretch out over a distance, space, time, or scope; run or extend between two points or beyond a certain point
To possess a certain extent.
To increase in extent.
Use to the utmost; exert vigorously or to full capacity

To stretch out; to prolong in space; to carry forward or continue in length
To enlarge, as a surface or volume; to expand; to spread; to amplify.
To enlarge; to widen; to carry out further; ; to continue, as time; to lengthen; to prolong.
To hold out or reach forth, as the arm or hand.
To bestow; to offer; to impart; to apply.
To increase in quantity by weakening or adulterating additions.
To value, as lands taken by a writ of extent in satisfaction of a debt; to assign by writ of extent.
A letter, or style of type, having a broader face than is usual for a letter or type of the same height.

To make long or longer; extend or elongate in space or in duration; protract or prolong: as, to lengthen a line; to lengthen life; to lengthen a vowel or syllable in pronunciation.
To grow long or longer; extend in length.
(transitive; intransitive verb) To make or become longer.

To stretch out in any direction, or in all directions; carry forward or continue in length or enlarge in area; expand or dilate: as, to extend roads, limits, or bounds; to extend the territories of a kingdom; to extend a metal plate by hammering.
To place horizontally, at full length.
To hold out or reach forth.
To make more comprehensive; enlarge the scope of; give a wider range to: as, to extend the sphere of usefulness; to extend commerce; to extend a treatise or a definition.
To continue; prolong: as, to extend the time of payment; to extend a leave of absence.
To hold out as a grant or concession; communicate; bestow; impart: as, to extend mercy to an offender.
To hold out in effort; put forth the strength or energy of: used reflexively.
To take by seizure; become seized of; pass by seizin or right of possession.
In law, to make a seizure of; fasten a process or grant upon, as lands under a writ of extent in satisfaction of a debt, or a writ of execution to levy and value.
To magnify; extol.
To plant or set out.
To survey; measure the extent of, as land.
To be stretched or drawn out; be continued in length, or in all directions; be expanded; stretch out: as, the line extends from corner to corner; the skin extends over nearly the whole body; his influence is gradually extending.
Unbend
Open or straighten out
Cause to be or last longer
Lengthen in time
Provide
Make available
Use to the utmost

Lessen, Shorten, Lie, Slow, Increase, Stretch, Renew, Protract, Enlarge, Broaden, Expand, Widen, Elongate, Extend, Prolong

Hold out, Unfold, Cover, Lead, Pass, Protract, Stretch, Run, Carry, Go, Offer, Widen, Prolong, Broaden, Expand

Lessen, Shorten, Lie, Slow, Increase, Stretch, Renew, Protract, Enlarge, Broaden, Expand, Widen, Elongate, Extend, Prolong

Gallop, Strain, Unfold, Cover, Lead, Pass, Protract, Stretch, Run, Carry, Offer, Widen, Prolong, Broaden, Expand

But the insurance company wont extend my stay.
Extend LTE mobile broadband service to rural communities.
In extend mode, EXT appears in the status bar, and the arrow keys extend the selection.
It may also oppose efforts to extend unnecessary regulation or to extend regulation to previously unregulated markets.
If your extend sizes are larger, but table data are less than the extend size, imp command will still allocated the initial extent.
The appraisal provision was not intended to extend, and does not extend, the time an insured could bring suit over such claims.
RV steps should fully extend when the door is opened or the extend button is held.
Franchisor is under no obligation to extend or exercise any option to extend any master lease.
Similarly, if it is necessary to extend other timelines establishedin the Agreement, be sure that these extensions do not extend past the Settlementate.
Turn extend mode on and use the arrow keys to extend a selection.