atop
prep. · adv. US //əˈtɑp// UK //ɐtˈɒp// atop
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1 on top of (prep.) B2 Upper Intermediate Literaryon the very top of something.
positioned on the highest point or surface of an object. Functions as a preposition taking a noun phrase object.
ExampleA small gold bird sat atop the wedding cake.
ExampleThe ancient fortress sat atop a jagged limestone cliff, overlooking the valley where the two rivers met.
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2 at the top (adv.) C1 Advanced Literary Archaicat or to the top of something.
at, on, or to the highest part. Used as an adverbial modifier without a following noun phrase.
ExampleThe mountain was steep, but the view from atop was beautiful.
ExampleThe hikers climbed for hours until they finally stood atop, gazing at the clouds drifting below the summit.
From a- (“on”) + top.