享受 (xiǎngshòu) means 'to enjoy' in a broad, everyday sense — a meal, a vacation, or life itself. 欣赏 (xīnshǎng) adds appreciation and admiration, typically for art or scenery; 享用 (xiǎngyòng) specifically means enjoying the use of facilities or a meal. 享有 (xiǎngyǒu) is formal, used for rights or privileges.