Mammoth Uncensored Word List:
49 - 6 letter words starting with at

ataata atabal atabeg atabek ataman atavic ataxia ataxic atelic athame athrob atigis atlatl atmans atocia atokal atokes atolls atomic atonal atoned atoner atones atonia atonic atopic atrial atrium attach attack attain attaps attars attask attend attent attest attics attire attone attorn attrap attrit attune atwain atweel atween atwixt atypic