mantle vs spread over

mantle is a noun but spread over is not a noun.

Word	Noun	Adjective	Verb	Adverb
mantle	Yes	No	Yes	No
spread over	No	No	Yes	No

As verbs, spread over is a hypernym of mantle; that is, spread over is a word with a broader meaning than mantle:

Other hypernyms of mantle include cover.

mantle (noun)	spread over (noun)
a sleeveless garment like a cloak but shorter
hanging cloth used as a blind (especially for a window)
shelf that projects from wall above fireplace
(zoology) a protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell
the cloak as a symbol of authority
the layer of the earth between the crust and the core
anything that covers

mantle (verb)	spread over (verb)
cover like a mantle	form a cover over
spread over a surface, like a mantle