logomaniac
/ˌloʊɡoʊməˈnæk/Definitions
1. noun
A person who has an excessive or unreasoning enthusiasm for logos, especially a person who is obsessed with branding or logos.
“The advertising executive had become a logomaniac, spending hours perfecting the company’s logo.”
2. noun
A person who has an excessive or unreasoning enthusiasm for words or language, especially in the form of logos or labels.
“The writer was a logomaniac, often getting caught up in the beauty of her own wordplay.”