English is an expansive language, anyone who has seen the size of an unabridged English dictionary can tell you that. It's also a language that's ever changing and evolving, so of course there are some words that fall out of favor and are hardly ever used, but maybe it's time to bring some of them back!
Thank You in 30 Different Languages This shows how some things might not look the same or even sound similar across different languages but are still expressed. "Thank you" is a universal concept, it is important to people to be able to express gratitude. So, languages (cultures) have evolved to include words with the agreed upon meaning to express the concept.