説明書

A leaf. 言葉, the word for language, is literally leaves of speech.

Long life, and the celebration of it. The character on wedding envelopes and New Year food.

Celebration, of the formal kind. 慶事 is a happy occasion; 慶応 is an era name.

Plain, undyed, just as it came. 素直 is honest and unguarded; 素材 is raw material.