• 連絡れんらく — contact, communication
• 連続れんぞく — continuation, series
• 関連かんれん — relation, connection
• 連休れんきゅう — consecutive holidays
• 連盟れんめい — federation, league
• 連隊れんたい — military regiment

The character 連 combines 辶 (movement) with 車 (vehicle), evoking the idea of things traveling or progressing together. It is commonly seen in terms related to connectivity and association — physical or abstract.

Words like 連絡れんらく (contact) and 連続れんぞく (continuity) reflect this sense of flow or linkage.

後あとで 連絡れんらくします。
I’ll contact you later.

三みっ日か 連続れんぞくで 雨あめが降ふりました。
It rained for three days in a row.

The on-yomi “レン” appears in almost all compound words. The kun-yomi like “つらなる” or “つれる” are used when describing things or people literally connecting or moving together.