べっか【別科】
a special course別科生a student in a special course
べっかく【別格】
あの人は別格だHe is special [a special case/an exceptional case].彼は別格の扱いを受けたHe was given special treatme...
べっかん【別巻】
a supplementary volume ((to))
べっかん【別館】
an annex,《英》 an annexe博物館の別館an annex to the museum/the museum annex
べっかせい【別科生】
a student in a special course