  Tamil language has an agglutinative, diglossic, alpha-syllabary structure
which provides a significant combinatorial explosion of morphological forms all
of which are effectively used in Tamil prose, poetry from antiquity to the
modern age in an unbroken chain of continuity. However, for the language
understanding, spelling correction purposes some of these present challenges as
out-of-dictionary words. In this paper the authors propose algorithmic
techniques to handle specific problems of conjoined-words (out-of-dictionary)
(transliteration)[thendRalkattRu] = [thendRal]+[kattRu] when parts are alone
present in word-list in efficient way. Morphological structure of Tamil makes
it necessary to depend on synthesis-analysis approach and dictionary lists will
never be sufficient to truly capture the language. In this paper we have
attempted to make a summary of various known algorithms for specific classes of
Tamil spelling errors. We believe this collection of suggestions to improve
future spelling checkers. We also note do not cover many important techniques
like affix removal and other such techniques of key importance in rule-based
spell checkers.
