How to Say "thing" in Spanish
The most common Spanish word for “thing” is “cosa” — use 'cosa' when referring to a general, unspecified object or matter, much like 'thing' in English when you don't know or don't need to specify what it is..
cosa
/KOH-sah//ˈkosa/

Examples
¿Qué es esa cosa en la mesa?
What is that thing on the table?
Tengo muchas cosas que hacer hoy.
I have many things to do today.
Dame esa cosa, por favor.
Give me that thing, please.
Always Feminine
'Cosa' is always a feminine word. That means you'll always say 'la cosa' (the thing) or 'una cosa' (a thing), never 'el' or 'un'.
Overusing 'Cosa'
Mistake: “Using 'cosa' for everything when a more specific word exists.”
Correction: While 'cosa' is your best friend when you forget a word, try to learn specific nouns. For example, instead of 'Pásame esa cosa para escribir', say 'Pásame el bolígrafo' (Pass me the pen).
objeto
oh-BHEH-toh/oˈβxeto/

Examples
Encontré un objeto extraño en el jardín.
I found a strange object in the garden.
Este objeto de cerámica es muy frágil.
This ceramic object is very fragile.
¿Puedes pasarme ese objeto que está sobre la mesa?
Can you pass me that thing that is on the table?
Gender Rule
Remember that 'objeto' is always masculine, so you must use 'el' or 'un' before it, and any describing words (adjectives) must also end in -o (e.g., 'el objeto rojo').
Confusing Noun/Verb
Mistake: “Using 'objeto' (the noun) when you mean 'objetar' (to object).”
Correction: Use 'objetar' for the action of opposing something; 'objeto' is usually the physical thing.
rollo
ROH-yoh/ˈro.ʎo/

Examples
Ellos tuvieron un rollo durante el verano, pero ya terminó.
They had a fling/thing during the summer, but it's over now.
¿Sabes si María tiene un rollo con el nuevo camarero?
Do you know if Maria is seeing (has a thing with) the new waiter?
Using 'Tener'
To talk about having this kind of relationship, you always use the verb 'tener' (to have): 'Tener un rollo con alguien' (to have a fling with someone).
negocio
/neh-GO-syo//neˈɣo.sjo/

Examples
El divorcio de mis padres fue un negocio muy complicado.
My parents' divorce was a very complicated affair.
¡Vaya negocio en el que te has metido!
What a mess you've gotten yourself into!
Arreglar los papeles de la visa es todo un negocio.
Sorting out the visa paperwork is quite a whole thing/ordeal.
roll
/rrohl//rol/

Examples
Me encanta el roll de este café; es muy relajante.
I love the vibe of this café; it's very relaxing.
¿Sabes si Marta y Pedro tienen un roll?
Do you know if Marta and Pedro have a thing going on?
No te preocupes por ese roll, ya se arreglará.
Don't worry about that situation, it will sort itself out.
Always Masculine
Even though this word is borrowed from English, treat it like a Spanish masculine noun. Always use 'el' or 'un' before it.
Using it outside of Spain
Mistake: “Using 'roll' to mean 'vibe' in most of Latin America.”
Correction: This slang is highly regional (Spain). Use 'ambiente' or 'atmósfera' instead for broader communication.
Distinguishing 'cosa' from 'rollo' and 'negocio'
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