Bragger and Big-timer

Bragger noun - Someone who boasts.

Big-timer and bragger are semantically related In some cases you can use "Big-timer" instead a noun "Bragger".

Big-timer noun - One of high position or importance within a group.

Bragger and big-timer are semantically related in braggart topic. You can use "Bragger" instead a noun phrase "Big-timer", if it concerns topics such as person who talks boastingly.