A syntactically-correct C program is word in the language C (any other language can substitute C in the sentence), using the classical definition of a formal language: https://en.wikipedia.org/wiki/Formal_language#Definition

When describing a specific programming language, "word" denotes a lower-level item: https://en.wikipedia.org/wiki/Syntax_(programming_languages)#Levels_of_syntax

I do not know what "everything non human, data or hardware in computing" comprises. :-)

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