Read means to look at words and understand them; a reed is a tall wetland plant, or the thin strip in an instrument such as a clarinet. Memory hook: you read a book, but reeds grow by a pond. The verb read also has a past form that sounds like "red".
The core difference
Read is a verb about understanding written words, while reed is a plant or an instrument part.
- read — to take in written words, or a piece of writing: She read the letter twice before replying.
- reed — a wetland plant, or a strip in a musical instrument: Reeds grew thick along the edge of the pond.
How to tell them apart
Present-tense read sounds just like reed, which is why they get muddled. The past tense of read is spelled the same but pronounced like "red", so only context tells you which sound is meant.
A reed can also be the strip that vibrates in a clarinet or saxophone: He replaced the reed on his clarinet before the concert. If the word is about words on a page, use read.