sillón bedeutet auf Englisch

armchair [armchairs]▼(a chair with supports for the arms or elbows)
noun
[UK: ˈɑːm.tʃeə(r)] [US: ˈɑːrm.ˌtʃer]This armchair is comfortable. = Este sillón es cómodo.

couch [couches]▼(furniture for seating of more than one person)
noun
[UK: kaʊtʃ] [US: ˈkaʊtʃ]I'll sit on the couch. = Yo me sentaré en el sillón.

sofa [sofas]▼(upholstered seat)
noun
[UK: ˈsəʊ.fə] [US: ˈsoʊ.fə]This sofa takes too much room. = Este sillón ocupa demasiado espacio.

armchair▼(remote from actual involvement)
adjective
[UK: ˈɑːm.tʃeə(r)] [US: ˈɑːrm.ˌtʃer]