How to Say "pillar" in Spanish
The most common Spanish word for “pillar” is “columna” — use 'columna' when referring to a physical, upright support structure, such as in architecture or a building..
columna
koh-LOOM-nah/koˈlumna/

Examples
Las columnas del templo griego eran de mármol blanco.
The columns of the Greek temple were made of white marble.
Necesitamos construir una columna de apoyo en el sótano.
We need to build a support column in the basement.
Gender Reminder
Even though 'columna' ends in '-a', it is a feminine noun, which is the most common pattern for Spanish nouns ending in '-a'.
roca
ROH-kah/ˈroka/

Examples
Su madre ha sido la roca de la familia durante todos estos años difíciles.
His mother has been the rock of the family during all these difficult years.
Aunque todo se derrumbó, él se mantuvo como una roca.
Even though everything collapsed, he remained like a rock (steadfast).
Using Figuratively
When using 'roca' to describe a person, you are emphasizing their emotional strength or reliability, not their physical appearance.
Physical vs. Metaphorical Use
Related Translations
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