How to Say "similarity" in Spanish
The most common Spanish word for “similarity” is “parecido” — use 'parecido' when referring to a noticeable resemblance, especially between people, often focusing on physical appearance or a strong, obvious likeness.
parecido
pah-reh-SEE-dohpaɾeˈsiðo

Examples
Hay un gran parecido entre padre e hijo, sobre todo en los ojos.
There is a great resemblance between father and son, especially in the eyes.
Si ves a alguien con un parecido a mí, salúdalo.
If you see someone who looks like me (a likeness), say hello to them.
Using the Noun
As a noun, 'parecido' is masculine singular ('el parecido'). It usually works with the verbs 'tener' (to have) or 'encontrar' (to find): 'Tener un parecido' means 'to have a resemblance'.
semejanza
seh-meh-HAHN-sahsemeˈxansa

Examples
Hay una gran semejanza entre los dos hermanos.
There is a great resemblance between the two brothers.
La semejanza de sus ideas nos sorprendió a todos.
The similarity of their ideas surprised us all.
Es difícil encontrar alguna semejanza entre estos dos cuadros.
It is difficult to find any similarity between these two paintings.
Using 'Entre'
When comparing two things, use 'entre' (between) right after 'semejanza', just like in the sentence: 'la semejanza entre tú y yo'.
Always Feminine
This word is always feminine. Even if you are comparing two men, you must say 'la semejanza'.
Confusing Noun and Adjective
Mistake: “Él es muy semejanza a su padre.”
Correction: Él es muy semejante a su padre (or 'Tiene una semejanza con su padre'). Use 'semejanza' for the 'thing' (the similarity) and 'semejante' to describe the person.
similitud
see-mee-lee-toodsimiliˈtuð

Examples
Hay una gran similitud entre los dos hermanos.
There is a great similarity between the two brothers.
La similitud de los resultados nos sorprendió a todos.
The similarity of the results surprised us all.
No encuentro ninguna similitud entre tu propuesta y la mía.
I don't find any similarity between your proposal and mine.
Always Feminine
Words ending in '-tud' in Spanish are almost always feminine. You should always use 'la' or 'una' with this word: 'la similitud'.
Using 'Between' or 'With'
When comparing two things, use 'entre' (between). When comparing one thing to another specific thing, use 'con' (with).
Gender confusion
Mistake: “el similitud”
Correction: la similitud. Words like gratitud, actitud, and similitud are always feminine.
Confusing with 'Similar'
Mistake: “es muy similitud”
Correction: es muy similar. Remember that 'similar' is a describing word (adjective), while 'similitud' is the name of the concept (noun).
Parecido vs. Semejanza/Similitud
Related Translations
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