Friend
noun
A person who is a friend is just that, a friend! Note that 友人 is a more formal word that’s often used in professional settings.
ゆうじん
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 人 has two on'yomi readings, here's a mnemonic to help you remember which one to use: All your friends are youths in jeans (ゆうじん)! Every single one. If any of your friends is not a youth in jeans, they're simply not your friend, I'm afraid.
マイケルさんは、父の友人です。
Michael is my father's friend.
アメリカ人の友人がいます。
I have an American friend.
友人のハネムーンについてきました。
I tagged along on my friend's honeymoon.