1. Noun

   uncle

   Honorific or respectful (sonkeigo) languageFamiliar languageUsually written using kana alone伯父さん is older than one's parent and 叔父さん is younger

2. old man; mister

   Familiar languageUsually written using kana aloneusu. 小父さん or おじさん; vocative

3. manybar goatfish (Parupeneus multifasciatus)

   Usually written using kana aloneusu. オジサン

Also written 叔父さん【おじさん】ojisan、小父さん【おじさん】ojisan