Textbook and Worksheet

Textbook noun - A book used for instruction in a subject.

Worksheet and textbook are semantically related. In some cases you can use "Worksheet" instead a noun "Textbook".

Worksheet noun - A sheet of paper with multiple columns; used by an accountant to assemble figures for financial statements.

Textbook and worksheet are semantically related. Sometimes you can use "Textbook" instead a noun "Worksheet".