alt Hacker NewsSurprised that no comment mentioned that there is a standard term (not a word :P) for the set of words that denominates a particular concept: nominal syntagm. Such as "boiling water" and also "that green parrot we saw yesterday over the left branch".
Also the slider examples are abysmal. "I love you", "Go home" and "How are you" are not words by any stretch of imagination. For someone who makes word games, I don't see a particularly deep love of words here.
Edit: Obligatory reference to Borges's Tlön: https://en.wikipedia.org/wiki/Tl%C3%B6n,_Uqbar,_Orbis_Tertiu...
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A nominal syntagm is a somewhat overlapping concept, but deviates slightly from the direct discussion taking place. The more appropriate standard term here is: open compound word. Or, as one might say casually: word.
Funnily enough, "nominal syntagm" is, itself, not in the OED or Wiktionary. But Wiktionary has "syntagme nominal" as the French translation for "noun phrase".
You really have to love the human messiness of language!