This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of spot.

n. In botany, same as necrosis, 2.

n. The tinting of photographs.

n. The process of separating a train into sections.

n. the act of spotting or staining something

n. the act of detecting something; catching sight of something

"A pair of binoculars are a great help in spotting squirrels especially in late winter when no foliage exists."

upon the spot   

spots    spotted    spotting   

attack    bemire    dirty    begrime    colly    grime    soil    subdivision    section    sight   

sully    discover    perceive    place    violet spot    spot cash    canker-spot    koplik's spots    yellow spot of the eye    blind spot   

spotted    spotting    goody    Lafayette    masooka    oldwife    redfish   

discriminate    resolve   

site    reproach    blot    flaw    disgrace    speck    locality    blemish    place    fault   

Bhatt    Dot    Kott    Lot    Lotte    Minot    Montserrat    Mott    Ott    Sadat   

place    patch    area    grind    one    point    line    scene    land    light