booking clerk vs seller

booking clerk and seller both are nouns.

Word	Noun	Adjective	Verb	Adverb
booking clerk	Yes	No	No	No
seller	Yes	No	No	No

As nouns, seller is a hypernym of booking clerk; that is, seller is a word with a broader meaning than booking clerk:

booking clerk: someone who sells tickets (e.g., theater seats or travel accommodations)
seller: someone who promotes or exchanges goods or services for money

Other hypernyms of booking clerk include marketer, trafficker, vender, vendor.

booking clerk (noun)	seller (noun)
someone who sells tickets (e.g., theater seats or travel accommodations)	someone who promotes or exchanges goods or services for money