• No commonly used compound words
• 且かつ — and; moreover (formal connector)
• 安やすく 且かつ 速はやい — cheap and fast
• 小ちいさく 且かつ 軽かるい — small and light

且 is used most often as the connector 且つ（かつ）, meaning “and / moreover”. It tends to appear in more formal writing, linking two qualities or points in a neat, logical way.