以下是一些可能有助于四年级下册学生学习“簇”字组词的单词，供您参考：
簇拥 (cù yōng) - to gather around, to flock to
簇新 (cù xīn) - brand new, fresh
簇火 (cù huǒ) - bonfire, cpfire
簇钻 (cù zuàn) - cluster of dionds
簇头 (cù tóu) - cluster, bunch, group
簇簇 (cù cù) - in clusters, in groups, densely packed
簇桥 (cù qiáo) - pontoon bridge
簇建 (cù jiàn) - to build in clusters
簇集 (cù jí) - to cluster, to gather, to collect
簇景 (cù jǐng) - group scenery, scenic area with clusters of landscapes
簇锦 (cù jǐn) - tapestry with clusters of patterns
簇流 (cù liú) - cluster stre, group flow
簇簇麻 (cù cù má) - a type of linen fabric with clustered bumps
簇山 (cù shān) - a cluster of mountains, a mountain range
簇草 (cù cǎo) - cluster of grass, clump of weeds
簇木 (cù mù) - cluster of trees, grove
簇簇密密 (cù cù mì mì) - densely packed, thickly clustered
簇簇紧紧 (cù cù jǐn jǐn) - tightly clustered, tightly packed
簇簇聚聚 (cù cù jù jù) - to gather in groups, to cluster together
簇簇攒攒 (cù cù zǎn zǎn) - to accumulate in clusters, to gather in piles
这些单词可以帮助学生理解“簇”字的不同用法和含义，同时也可以帮助学生扩展自己的词汇。