Blowhard and Big-timer

Blowhard noun - A person who talks constantly.

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

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

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