That rock is so slippery, I nearly slipped!
Yes, the compound word 'rock collection' is the noun in the sentence. The noun 'rock collection' is a word for a thing.
Example sentence - The landscape looked awful after the miners left it rock strewn and deplete of vegetation.
it depends on what you got in the sentence.
Marble is metamorphosed limestone. The word is also used in the masonry trade to describe sedimentary rock that can be polished, but my first sentence is the geological answer.
That rock is a solid object.
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You just used the word acolytes in a sentence. Even saying, "can the word acolytes be used in a sentence", you are using that word in a sentence.
The rock rocked the rock show like a rock star! This is one of many examples for sentence usage.
Igneous is a type of rock.
Geode is a rock or stone with crystals.
He etched his name into the rock.
For their 20th anniversary, he took his wife back to the rock where he proposed to her.