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 challenge.

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

"But U.S. spokesmen are stressing the continued value of engagement with, and aid to, Pakistan, and saying the Obama administration is committed to working through what they term challenges in the relationship."

array    favor    polls   

challenged    challenges    challenging   

demand    objection    call for    request    bespeak   

question    objection    challenge for cause    challenging    challenger   

defiance    censure    blame    question    object   

threat    problem    decision    concern    task