作曲同作詞既英文係咩

作曲 compose, composer
作詞 lyrics writing, lyricist

作詞 lyrics by ...
作詞者 lyric writer
i.e. Lyrics to My Heart Will Go On by Celine Dion

作曲 music by ... / compose / composing / composition / write / melodize
i.e. This song composed a piece of music / composed music by Peter.
大作曲家 maestro

作曲:你可以話compose a piece of music 或者create a piece of music
作詞:你可以話fill in the lyrics for a piece of music 或者 songwriting