Rhymes:English/ɒpɪkəl

Three syllables

 * topical
 * tropical

Four syllables

 * anthropical
 * dystopical
 * pantropical
 * subtropical
 * utopical

Five syllables

 * allotropical
 * extratropical
 * macroscopical
 * microscopical
 * misanthropical
 * necroscopical
 * neotropical
 * semitropical
 * spectroscopical
 * telescopical