What is a word? Not silly but dead-serious question

Under the Visual filter we are given and option Corresponding words under which we get 4 options: word, surface, lemma, root. I can get the last three to work as I would expect ... but (a) I don't know what it meant by "word" and (b) I can't get it to do anything. So what is a word? Please.

Orthodox Bishop Alfeyev: "To be a theologian means to have experience of a personal encounter with God through prayer and worship."; Orthodox proverb: "We know where the Church is, we do not know where it is not."

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