GNU Collaborative International Dictionary of English

Found one definition

      
Alas , interj. [OE. alas, allas, OF. alas, F. hélas; a interj. (L. ah.) + las wretched (that I am), L. lassus weary, akin to E. late. See Late.] An exclamation expressive of sorrow, pity, or apprehension of evil; -- in old writers, sometimes followed by day or white; alas the day, like alack a day, or alas the white.
1913 Webster

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-Est, Best, Blest, Cest, Est, Fest, Gest, Hest, Jest, Kest, Last, Least, Leat, Leet, Left, Lent, Les, Lese, Less, Lest, Let, List, Lost, Lust, Mest, Nest, Pest, Rest, Test, Vest, West, Yest, Zest