The movie was made circa thirty years before the word "robot" was even coined.
Yes, TFS mentions that.
It also looks more like an automata
The singular form is "automaton"; "automata" is plural, and is the name of the book on the subject by Heron of Alexandria (circa 1st century).
Robots are automata.
The International Standards Organisation defines robots as programmable machines with at least three degrees of freedom. That falls within the scope of Heron's automata.
Around the 16th century, when Heron's book was translated into Italian, androids (automata that looked like people, what today we might call animatronics, or puppets) became popular with show people. Those who built and operated them were known as necromancers. (Although at least one Christ-shaped temple machine was in operation since the late middle ages.)
The word "robot" is younger, of course, as the fine summary mentions, and in Capek's play it didn't refer to automata, but rather to mass-produced variants of Frankenstein's creature. (From the book, not the Hammer Films adaptation, which is very different, and also quite a bit later.) In his books, Isaac Asimov distinguished between androids (made from organic tissue like Frankenstein's creature and Capek's robots) and robots (ambulatory positronic computers, sometimes humaniform).
The Golem of Prague also perfectly fits the description of a robot, although it is centuries older than the word.
(The word "golem" meant someone who does menial tasks. That particular golem happened to have been a programmable machine, made from clay in an imitation of the story of Genesis, so a sophisticated form of necromancy. Although there is no evidence that the story isn't science fiction.)
There's an even older story from China, about a puppet that is so human-like that the king doesn't believe that it isn't a human, until the creator dismantles his work to prove it, destroying it in the process.
Going further back, Hesiod describes the Greek god Hephaistos (Vulkan in the Roman adaptation) as creating different kinds of automata, including tables that move around by themselves, and even a sex bot made from gold. (The story of Pygmalion probably doesn't count, it's just about a life-like statue that miraculously comes to life.)