Difference between Changeable and Erratic

CHANGEABLE vs ERRATIC: NOUN

A rock moved from one location to another, usually by a glacier.
Any stone or material that has been borne away from its original site by natural agencies; esp., a large block or fragment of rock; a bowlder.
A rogue.
One who deviates from common and accepted opinions; one who is eccentric or preserve in his intellectual character.
An eccentric person.
Specifically In geology, a boulder or block which has been conveyed from its original site, probably by ice, and deposited at a distance; an erratic block. See erratic blocks, under I.
One who or that which has wandered; a wanderer.
A rock fragment that has been transported by ice to a location other than its place of origin and that may range in size from a pebble to a large boulder.
Anything that has erratic characteristics.

Subject to sudden or frequent changes.
Capable of being changed.
Appearing different, as in color, in different lights, or under different circumstances.
Capable of change; subject to alteration; mutable; variable; fickle; inconstant.
Varying in color or appearance when seen from different angles.
Being such that alteration is possible.
Liable to change; capricious.
Capable of or tending to change in form or quality or nature
Varying in color when seen in different lights or from different angles
Subject to change
Such that alteration is possible; having a marked tendency to change

Likely to perform unpredictably
Having no fixed course
Liable to sudden unpredictable change
Having no fixed or regular course; wandering.
Lacking consistency, regularity, or uniformity.
Deviating from the customary course in conduct or opinion; eccentric.
Unsteady, random; prone to unexpected changes; not consistent
The phenomena which relate to transported materials on the earth's surface.
Masses of stone which have been transported from their original resting places by the agency of water, ice, or other causes.
Irregular; changeable.
Deviating from a wise of the common course in opinion or conduct; eccentric; strange; queer.

Having a marked tendency to change
Such that alteration is possible
Liable to change; subject to alteration or variation; fickle; inconstant; mutable; variable: as, a person of a changeable mind.
Having the quality of varying in color or external appearance:” as, changeable silk; the changeable chameleon.
Unstable, uncertain, wavering, vacillating.

Sometimes it would start and sometimes it wouldn't"
In zoology, occurring in an unusual location.
Wandering; having no certain course; roving about without a fixed destination.
Deviating from the proper or usual course in opinion or conduct; eccentric.
Moving; not fixed or stationary: applied to the planets as distinguished from the fixed stars.
In medicine, irregular; changeable; moving from point to point, as rheumatic or other pains, or appearing at indeterminate intervals, as some intermittent fevers.
In geology, relating to or explanatory of the condition and distribution of erratics. See II., 2.

Iridescent, Fluid, Mercurial, Kaleidoscopic, Reversible, Uncertain, Erratic, Adjustable, Colorful, Unsettled, Volatile, Unstable, Fickle, Variable, Mutable

Volatile, Uneven, Unpredictable, Inconsistent, Changeful, Planetary, Wandering, Quicksilver, Changeable, Fickle, Unsettled, Undependable, Unreliable, Mercurial, Temperamental

Iridescent, Fluid, Mercurial, Kaleidoscopic, Reversible, Uncertain, Erratic, Adjustable, Colorful, Unsettled, Volatile, Unstable, Fickle, Variable, Mutable

Volatile, Uneven, Unpredictable, Inconsistent, Changeful, Planetary, Wandering, Quicksilver, Changeable, Fickle, Unsettled, Undependable, Unreliable, Mercurial, Temperamental

Need to keep changeable message signs updated better.
Presumably Jones is one of those changeable points.
Contentedly changeable faction is repeated past a mole.
Monument Signs may not be Manually Changeable Copy.
Signage permitted shall include the changeable copy signs.
Be prepared for changeable weather and variable terrain.
CHANGEABLE SIGN An electrically activated changeable sign with the capability of content change by means of manual or remote input or electronic programming.
Signs that contain changeable copy that can only be altered by manual means shall not be considered changeable signs.
Because the other is changeable, because all things that are not frozen change, because I am changeable, I must approach affordances with openness.
Changeable copy lettering within any approved changeable copy sign area, and conforming to the provisions of the section related to changeable copy type signs.

Welding machines with erratic arcs also waste energy.
Has erratic eating habits, often refusing to eat.
Deviating, erratic, wandering, out of the common way.
That is what causes this erratic, moody behaviour.
By contrast, visceral referral is much more erratic.
Any ideas of why this has erratic function?
MATTHEWS: Well, this all seems pretty erratic, Michael.
Much too often he is erratic and distracted.
Bookchinreflect the characteristic of being uneven and erratic.
Furthermore, their study revealed that waste collection in Gweru is not only erratic but also erratic as waste collectors leave behind some wastes.