초대장이 · 초대장을
invitation (card or letter)
Example
생일 파티 초대장을 예쁘게 만들었어요.
I made a pretty invitation for the birthday party.
Word parts
초 beckon+대 treat, wait+장 letter, document
Literally 'beckon-and-treat letter'.
Good to know
A wedding invitation has its own word: 청첩장.
Related words