Difference between Blur and Smudge

BLUR vs SMUDGE: NOUN

A hazy or indistinct representation
That which obscures without effacing; a stain; a blot, as upon paper or other substance.
A blurred condition; a dim, confused appearance; indistinctness.
Figuratively, a blot, stain, or injury affecting character, reputation, and the like.
A smudge or smear, such as that made by brushing writing or painting before it is dry; a blot which partially defaces or obscures.
Something that is hazy and indistinct to the sight or mind.
Something that appears hazy or indistinct
A dim, confused appearance; indistinctness of vision.
A moral stain or blot.
A smear, smudge or blot

A suffocating smoke.
In the game of set-back all-fours, the player who bids 4 and makes it, winning the came on the hand if he is not in the hole on the score at the time.
The scrapings and cleanings of paint-pots, collected and used to cover the outer sides of roof-boards as a bed for roofing-canvas.
A spot; stain; smear.
A heap of damp combustibles partially ignited and burning slowly, placed on the windward side of a house, tent, or the like, in order, by the thick smoke, to keep off mosquitoes or other insects.
That which is smeared upon anything; a stain; a blot; a smutch; a smear.
A smoky fire used to protect against frost or to repel insects.
A blurry or indistinct part or image.
A blotch or smear.
A heap of combustibles partially ignited and emitting a dense smoke; especially, such a fire made in or near a house, tent, or the like, so as to raise a dense smoke to repel insects.
A blemish made by dirt
A blemish; a smear.
Dense smoke, such as that used for fumigation.
A smoky fire to drive away insects

To make dirty, especially in one small area.
To smear or blur (something).
To fill (an orchard or an inhabited area) with dense smoke from a smudge pot in order to prevent damage from frost or to repel insects.
To smear something, such as dirt or soot.
To become smudged or blurred.

To render obscure by making the form or outline of confused and uncertain, as by soiling; to smear; to make indistinct and confused.
To cause imperfection of vision in; to dim; to darken.
To sully; to stain; to blemish, as reputation.

To obscure or sully (a thing) with something which detracts from its fairness or beauty.
To sully; stain; blemish: as, to blur one's reputation.
To obscure without quite effacing; render indistinct; confuse and bedim, as the outlines of a figure.
To dim the perception or susceptibility of; make dull or insensible to impression: as, blurred eyesight; to blur the judgment.
To make blurs in writing.
Become glassy
Lose clear vision
Make a smudge on
Soil by smudging

To smear or stain with dirt or filth; blacken with smoke.
To smoke or cure, as herring.
To stifle; smother.
To make a smudge in; fumigate with a smudge: as, to smudge a tent so as to drive away insects.
Soil by smudging
Make a smudge on

Erase, Fading, Distort, Fade, Glaze over, Blear, Film over, Smutch, Slur, Obscure, Smear, Dim, Fuzz, Confuse, Smudge

Dust, Blob, Taint, Birthmark, Scar, Blemish, Stain, Smutch, Smirch, Spot, Slur, Smear, Blur, Daub, Blot

Mist, Erase, Fading, Distort, Fade, Smutch, Glaze over, Blear, Slur, Obscure, Smear, Dim, Fuzz, Confuse, Smudge

Dirt, Dust, Blob, Taint, Birthmark, Scar, Blemish, Stain, Smutch, Smirch, Spot, Slur, Smear, Blur, Blot

My favorite quick blur to use in After Effects is the Box Blur.
Blur opacity can also be set along with a unique blur seed.
You can adjust blur levels to get necessary portrait mode blur effect.
Blur functionality which will allow you to blur your sensitive information.
Tooltip: Blur multiplicator of box blur after bokeh to smoothen shape.
Previously we had Field blur, iris blur and tilt shift.
We generate two sharpness distortions: motion blur and Gaussian blur.
Blur Gallery filter, which is underneath the Blur Layer.
Calculate the blur amount based on the luminosity of the current pixel in the blur image and use that to define the blur radius.
The bilateral blur effects, blur selectively blur some edges and areas of an image and preserve detail of other area.