HSK 4
不光
bùguāng副连
not the only one; not only
不光学生能参加，家长也可以。
Bù guāng xué shēng néng cān jiā, jiā zhǎng yě kě yǐ.
Not only students but also parents may participate.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 4.