This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. A person who invents or uses slogans.

verb-intransitive. To invent or use slogans.

n. Someone who makes and spreads slogans

v. To make and disseminate slogans; often contrasted with substantive debate

n. someone who coins and uses slogans to promote a cause

v. coin new slogans

"Kathleen Dienne has been a reporter, a theatrical stage manager, a ghostwriter, a sloganeer, a video game consultant and a marketing analyst."

sloganeering   

propagandist    coin