noun
A word that represents a person, place, thing, or idea. In this case, 'act' and 'law' are both nouns.
preposition
A word that shows the relationship between a noun or pronoun and other words in a sentence. In this case, 'of' is a preposition that connects 'act' and 'law'.
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The act of law clearly states that all citizens must abide by the rules set forth by the government.
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Hey, did you hear about that new act of law that just got passed? It's going to affect a lot of people.
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I can't believe they're trying to enforce that act of law on us, it's so unfair.
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In the game of politics, sometimes passing an act of law is just a move on the chessboard.