Groomsman
/ˈɡruːmzmən/
Definition 1 of 1
Pro Tip 1/3Wedding Role
A groomsman is a specific role in Western-style weddings with responsibilities like supporting the groom. 
During the ceremony, the groomsmen lined up beside the groom.
Pro Tip 2/3Cultural Variance
The concept of a groomsman might vary or not exist in different cultures; it's primarily Western. 
In his Indian wedding, Raj had no groomsmen but his closest male relatives participated.
Pro Tip 3/3Not Always Best Man
Though similar, a groomsman is not the 'best man', who has a more prominent role in the wedding. 
He was honored to be a groomsman, although his brother was the best man.