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 clock.

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

n. European weed naturalized in the southwestern U. S. and Mexico (Erodium cicutarium), having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender pinlike fruits that stick straight up; it is often grown for forage.

n. European weed naturalized in southwestern United States and Mexico having reddish decumbent stems with small fernlike leaves and small deep reddish-lavender flowers followed by slender fruits that stick straight up; often grown for forage

"For you know -- or will learn -- that there are clocks _and clocks_."

heron's bill    storksbill   

clock   

redstem storksbill    alfilaria    alfileria    filaree    filaria    pin grass    pin clover   

clock   

Cox    Fox    Foxx    Jocks    Knox    Ochs    Sachs    Sox    ballcocks    blocks