cloud vs cloud over

cloud is a noun but cloud over is not a noun.

Word	Noun	Adjective	Verb	Adverb
cloud	Yes	No	Yes	No
cloud over	No	No	Yes	No

cloud (noun)	cloud over (noun)
a group of many things in the air or on the ground
a visible mass of water or ice particles suspended at a considerable altitude
any collection of particles (e.g., smoke or dust) or gases that is visible
suspicion affecting your reputation
out of touch with reality
a cause of worry or gloom or trouble

cloud (verb)	cloud over (verb)
colour with streaks or blotches of different shades	become overcast
make milky or dull	become covered with clouds
make less clear
place under suspicion or cast doubt upon
make gloomy or depressed
billow up in the form of a cloud
make less visible or unclear
make overcast or cloudy