Similar words
butaca
butaca is more a theatre or cinema seat; sillón is more a home armchair.
Similar in other languages
French
fauteuil
fauteuil is the French word for the same thing — both mean "armchair."
Portuguese
poltrona
poltrona is the Portuguese word for the same thing — both mean "armchair."
Practice
1 What does sillón mean?
armchair
2 Fill the gap: Leo en el ___.
Full sentence: Leo en el sillón. (I read in the armchair.)
3 Which fingerprint chart matches sillón?
sillón: neutral register, core frequency, general domain, neutral connotation.