To make sth difficult to see by coveing it

Hide
- The church roof was half hidden by trees.
- The road was hidden by a large building.

Conceal
To cover something so that it is hidden:

- A long velvet curtain concealed a small doorway.
- That hat concealed her hair.
- A pair of carved cupboards concealed the door.

Shroud
(of an area)To be covered by smoke,fog,mist, darkness so that it can not be seen:

- Mist shrouded the outline of Buckingham Palace.
- Suddenly all the lights went out and the house was shrouded in darkness.
- The mist shrouding the valley had lifted by eight o'clock.
Under shroud of
- The village vanished under shroud of fog/mist.
-A parked car huddled under a shroud of grey snow. 


Cover
To put or spread something over something:

- Snow covered the hillsides.
- She covered him with a blanket.
- The clouds had spread and nearly covered the entire sky...
- The desk was covered with papers...

Veil
To cover with or as if with a veil:

- Dense fog veiled the bridge.
- A thin mist veiled the lake.
Behind/beneath a veil of 

(formal) a thin layer that stops you from seeing sth:

-The mountain tops were hidden beneath a veil of mist.

- Shrouded in an eerie veil of mist.

-The moon was hidden and a veil of mist covered the mountain.

Draw a veil over (Slightly formal)
To hide something:

- Dense fog drew a veil over the landscape.

-  Snow drew a veil over the hill.

Cloak
A word which is often used in literary writing meaning to cover or hide something with something else:

- The river is often cloaked in (= covered by) mist in the early morning.

- The hills were cloaked in thick mist.

- The beautiful sweeping coastline was cloaked in mist.

Note that A cloak of something such as mist or snow completely covers and hides something.

Blanket
A formal word meaning to cover something completely with a thick layer:
be blanketed with/in something:

- Outside the fields were blanketed in fog.
- More than a foot of snow blanketed parts of Michigan.
- The room was entirely blanketed in dust.
Under blanket of

- The mud disappeared under a blanket of snow...
- Cold damp air brought in the new year under a blanket of fog. 


Mantle
(literary)a mantle of snow/darkness etc:something such as snow or darkness that covers a surface or area:

- A mantle of snow lay on the trees.
- The houses were covered with a thick mantle of snow.
- Hills with a mantle of snow.
- A grey mantle of mist shrouding the slopes.
Under mantle of
Literary a layer of something which covers a surface or area for example a layer of snow on the ground. 

- We watched the building vanish under a mantle of thick grey smoke
- The parks and squares looked grim under a mantle of soot and ash.
- A mantle of snow lay on the trees.
- The houses were covered with a thick mantle of snow.
- A grey mantle of mist shrouding the slopes


Obscure
to prevent something from being seen properly:

- Mist obscured the view.
- Her face was partially obscured by the shadows.

Blot out
To cover something completely so that you are not able to see it.to darken; make dim;

- The clouds/thick smoke blotted out the sun.
- The victims' faces were blot out by a camera blur.

Obliterate
To cover something completely so that it cannot be seen.

- Then the fog came down, obliterating everything.
- fog obliterated the mountain from view.
- The park had been obliterated beneath a layer of snow.
- clouds were darkening, obliterating the sun

Mask
To cover in order to conceal something:

- His blue eyes were masked by dark glasses.
- They were robbed by a man wearing a ski mask.
Behind/beneath a/the mask of ~

- Two eyes glared at him from beneath the mask.  

- two men in black masks  .