Blowhard
Definition 1 of 2

Metaphor
The word 'blowhard' suggests that the person is full of hot air, similar to a balloon. This can imply that their boasts are empty. For example, someone who constantly exaggerates their success may be a blowhard.
Context
Watch the setting in which you use 'blowhard.' It’s often informal and could be seen as rude in more formal situations.
Nuance
Use 'blowhard' to convey annoyance at someone who talks too much about their own importance or abilities.
Compare with
braggartloudmouthshow offwindbag
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