\hyphenation
\hyphenation{word-one word-two}
The \hyphenation
command declares allowed hyphenation points
with a -
character in the given words. The words are separated
by spaces. TeX will only hyphenate if the word matches exactly, no
inflections are tried. Multiple \hyphenation
commands
accumulate. Some examples (the default TeX hyphenation patterns
misses the hyphenations in these words):
\hyphenation{ap-pen-dix col-umns data-base data-bases}