Bighead and Know-all

Bighead noun - An often unjustified feeling of being pleased with oneself or with one's situation or achievements.

Know-all and bighead are semantically related. in boaster topic. In some cases you can use "Know-all" instead a noun "Bighead".

Know-all noun - Someone who thinks he knows everything and refuses to accept advice or information from others.

Bighead and know-all are semantically related. You can use "Bighead" instead a noun phrase "Know-all".