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

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n. Plural form of grass.

v. Third-person singular simple present indicative form of grass.

"As we leave the village, we see two men weaving through the tall grasses from the direction of the Rwandan Hutu camp."

to put out to grass   

grassed    grasses    grassing   

marihuana    cannabis    ganja    marijuana    informer    betrayer    rat    blabber    squealer    pasture   

candy-grass    yellow grass    fowl-grass    redfield's grass    grass of the andes    everlasting grass    spur-grass    bhabur grass    elm-grass    grape-vine grass   

grassy    grass widow    grasshopper   

pasture    spring    marijuana    land    cereal    bent    eddish    hay    couch    fiorin   

Alsace    Cass    Glass    Grasse    Jas    Mass    Mass.    Nass    Pass    Ras   

tree    flower    snow    bush    rock    plant    leave    soil    grind    meadow