spread over vs mantle

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

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

As verbs, mantle is a hyponym of spread over; that is, mantle is a word with a more specific, narrower meaning than spread over:

spread over (noun)	mantle (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

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