一叢[hitomura] copse
稲叢[inamura] stack of rice straw
叢がる[muragaru] to swarm
叢雨[murasame] passing shower
叢時雨[murashigure] autumn shower

叢書[sousho] series (of publications)
叢生[sousei] dense growth
叢談[soudan] collection of stories
叢氷[souhyou] pack ice
叢立ち[soudachi] standing in a group

深淵[shinen] abyss
淵源[engen] origin
淵叢[ensou] gathering spot

海淵[kaien] ocean depths
深淵に臨むが如し[shinenninozomugagotoshi] like looking out on an abyss
淵酔[ensui] type of imperial banquet held during the Heian period and later