sillón
armchair
silla
chair
+
-ón
augmentative suffix
A sillón is an armchair, which can be thought of as a larger, more comfortable silla0 (chair0) with the -ón1 suffix indicating it's bigger1.
noun
- armchairA large, comfortable chair, typically with armrests, used for relaxing.Me gusta leer en mi sillón favorito. // I like to read in my favorite armchair.