Last week we organized a birthday dinner.
It was raining and a bit cold, but inside it was warm and cozy.
A friend —who is learning Spanish— was looking at the bottle of wine she had brought.
I asked her: “Do you want a corkscrew?”
She looked at it and said: “Oh… a corkscrew.”
“No, sacacorchoS,” I gently corrected her.
“But it’s just one… it’s singular. Why does it end in -s?” she asked.
As I explained it, I realized something.
We were surrounded by words that mislead learners in the exact same way.
Un paraguas colgado en la puerta.
An umbrella hanging by the door.
Ella resfriada por un virus.
She had a cold caused by a virus.
Un microondas funcionando en la cocina.
A microwave working in the kitchen.
They all looked plural… but they weren’t.
And I thought: this is perfect for a newsletter.
The truth behind these “false plurals”
Why do words like paraguas, sacacorchos or microondas end in “-s” even when they’re singular?
Because they are compound words where the second element is already plural.
Let’s look at a few examples:
Paraguas comes from parar + aguas (“to stop + waters”).
Sacacorchos comes from sacar + corchos (“to remove + corks”).
Cumpleaños comes from cumplir + años (“to turn + years”).
Microondas comes from micro + ondas (“micro + waves”).
When there is already a plural marker inside the word, you don’t add another one.
That’s why we say: el paraguas / los paraguas.
And the same with el sacacorchos / los sacacorchos.
The article is the only thing that changes.
And what about “virus”?
Virus is not a compound word.
It comes from Latin, but it is also invariable.
In Spanish, multisyllabic nouns ending in an unstressed -s do not change in the plural.
That’s why we say: el virus / los virus.
Other equally tricky examples
El ciempiés → los ciempiés
The centipede → the centipedes
El abrelatas → los abrelatas
The can opener → the can openers
El rompecabezas → los rompecabezas
The puzzle → the puzzles
✨ Conclusion: in Spanish, not everything is what it seems
These words reminded me of something important:
The last letter doesn’t always tell the full story.
In Spanish, sometimes you need to look inside the word.
And if this topic interests you, you’ll love the video I made about when to use “el” or “la.”
Mirá el video aquí / Watch the video here:
Es la continuación perfecta.
It’s the perfect continuation.
