Statement of appreciation

• Gift recipient's sentiment
• Response to "What do you say?"
• Polite expression
• Polite words
• Recipient's reply
• Response to ''What do you say?''
• Note from a recipient
• Bread-and-butter note's message

Wiktionary Word definitions in Wiktionary
interj. (alternative spelling of thank you English) n. (alternative spelling of thank-you English)