The short answer
Chord and cord are pronounced the same way, but they mean different things and are never interchangeable. A chord is a set of musical notes played together, or a straight line connecting two points on a curve. A cord is a length of thin rope, string, or cable, and can also refer to a structure in the body, as in spinal cord or vocal cords.
- Chord: musical notes played together, or a geometry term
- Cord: rope, string, cable, or a body structure
What chord means
In music, a chord is three or more notes sounded at the same time, such as a C major chord. A guitarist strums a chord, and a pianist can hold several chords in one hand. In mathematics, a chord is a straight line segment that joins two points on a circle or curve without passing through the center. Both senses share the idea of notes or points being drawn together.
Chords are named by their root note and quality, such as C major or A minor, and musicians often learn chord shapes before they learn to read full sheet music. In geometry, a chord's length depends on how far it sits from the center of the circle; a chord that passes through the center is the longest possible and is called a diameter.
What cord means
Cord usually names a physical strand: an extension cord, a cord of firewood, or the cord on a lamp. It also appears in body parts, such as the spinal cord and the umbilical cord, where it describes a rope-like structure. Not: She played a beautiful cord on the piano. That sentence needs chord, since it describes music rather than rope.
A cord can also describe a unit of measurement for stacked firewood, or a thin length of fabric used as a belt or drawstring on clothing. In figurative use, phrases like cut the cord describe ending a dependence on something, drawing on the image of a physical cord being severed.
How to tell them apart
Think about what the sentence describes. If notes, harmony, or a line across a curve are involved, use chord. If you mean rope, cable, string, or a body structure, use cord. A quick test: try substituting the word string. If string fits, cord is usually correct, because both words name something long and thin that connects or ties.
If you catch yourself unsure mid-sentence, read the sentence aloud and listen for whether you are describing sound or an object you could hold in your hand. Chords are heard; cords are handled, plugged in, coiled, or cut, and that sensory difference is often the fastest way to settle the choice.
Remember it
Link chord to choir, since both start with ch and involve sound. Link cord to cable, since both start with c and describe something you can coil or plug in. With that pair of associations, you will rarely reach for the wrong spelling again, even while writing quickly under time pressure.
Frequently asked questions
Is chord or cord used for guitar strings?
Neither directly; guitar strings are simply called strings. Chord refers to the notes you play together on those strings, not the strings themselves.
What is a spinal cord?
The spinal cord is the rope-like bundle of nerves running through the spine, always spelled cord because it names a physical, string-like structure.
Can cord ever mean a musical term?
No. Cord never refers to music or notes; that meaning always belongs to chord, as in a guitar chord or a major chord.
Try it with a real collection
Explore academic vocabulary or print a Frayer model to put these ideas into practice.