This is the 11700th most frequent Korean word.
남편이자
"남편이자" means "husband and."
In this sentence, the word '남편이자' connects '남편' (husband) and '가장 친한 친구' (best friend), showing a dual characteristic of the subject.
그는 나의 남편이자 가장 친한 친구이다.
He is my husband and also my best friend.
Although this sentence doesn't use '남편이자', it demonstrates a similar construction with '연기자이자', explaining how roles/features combine.
그 여배우는 뛰어난 연기자이자 두 아이의 어머니이다.
That actress is an excellent actress and also a mother of two children.
Here '남편이자 친구' characterizes the subject as fulfilling the roles of both husband and friend.