This article introduces the NFL7 (Nuclear Family List 7), a list of the 2,887 most frequent “nuclear” word families, that is, families that include just the most frequent family members and exclude those that constitute less than 7% of family occurrences. The NFL7 was developed by using a dedicated computer program, the Nuclear List Builder (freely available to users). To construct the list, we used that tool to reduce the complete BNC/COCA lists of the 3,000 most frequent word families from 19,062 to 7,293 word types and from 9,132 to 5,610 lemmas. Despite this reduction, the NFL7 compares favorably with other lists in terms of text coverage, and it includes a small number of the most frequent derivational affixes. We argue that the nuclearization of the list makes it suitable for nonadvanced learners, for teaching and testing both receptive and productive knowledge, and for instruction in basic morphology.

中文翻译：

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核心词家族列表：最常见的家族成员列表，包括基本词和附加词

本文介绍了 NFL7（核家族列表 7），该列表列出了 2,887 个最常见的“核”词家族，即仅包含最频繁的家族成员并排除那些占家族出现次数少于 7% 的家族。NFL7 是通过使用专用计算机程序核列表生成器（用户免费提供）开发的。为了构建列表，我们使用该工具将 3,000 个最常用词族的完整 BNC/COCA 列表从 19,062 个词类型减少到 7,293 个词类型，从 9,132 个词条减少到 5,610 个词条。尽管有这种减少，但 NFL7 在文本覆盖率方面与其他列表相比毫不逊色，并且它包含了少量最常见的派生词缀。我们认为列表的核化使其适合非高级学习者，