WordNet 中的 "derivationally related forms" 是什么？

Question

WordNet 词条可以有派生相关形式。例如，名词 "butter"（意思是你涂在面包上的酱）被认为与动词 "butter"（意思是在面包上涂抹黄油的行为）有派生关系：

>>> from nltk.corpus import wordnet as wn
>>>
>>> wn.lemma('butter.n.01.butter')
Lemma('butter.n.01.butter')
>>> wn.lemma('butter.n.01.butter').synset().definition()
u'an edible emulsion of fat globules made by churning milk or cream; for cooking and table use'
>>> wn.lemma('butter.n.01.butter').derivationally_related_forms()
[Lemma('butter.v.01.butter'), Lemma('buttery.s.02.buttery'), Lemma('butyraceous.a.01.butyraceous')]
>>> wn.lemma('butter.n.01.butter').derivationally_related_forms()[0]
Lemma('butter.v.01.butter')
>>> wn.lemma('butter.n.01.butter').derivationally_related_forms()[0].synset().definition()
u'spread butter on'
>>>
>>> wn.lemma('flood.n.01.flood').synset().definition()
u'the rising of a body of water and its overflowing onto normally dry land'
>>> wn.lemma('flood.n.01.flood').derivationally_related_forms()
[Lemma('flood.v.04.flood'), Lemma('deluge.v.01.flood'), Lemma('flood.v.02.flood')]
>>> wn.lemma('flood.n.01.flood').derivationally_related_forms()[0]
Lemma('flood.v.04.flood')
>>> wn.lemma('flood.n.01.flood').derivationally_related_forms()[0].synset().definition()
u'become filled to overflowing'
>>>

但是，"derivationally related" 一词的确切含义并不清楚。例如，我可以争辩说 "television" 和 "telescope" 是 "derivationally related"，因为这两个词都源自古希腊语 "têle"，意思是 "far"。但 WordNet 不同意：

>>> wn.lemma('telescope.n.01.telescope').derivationally_related_forms()
[Lemma('telescopic.s.01.telescopic'), Lemma('telescopic.s.02.telescopic')]

那么，WordNet 对 "derivationally related form" 的定义究竟是什么？这在任何地方都有记录吗？

Answer 1

来自WordNet glossary：

derivationally related forms: Terms in different syntactic categories that have the same root form and are semantically related.

动词 "to butter" 与名词 "butter" 具有相同的 root form，它们是不同的句法类别（动词与名词），并且它们在语义上明显相关。

另一方面，"television" 和 "telescope" 没有相同的词根形式（但例如 "to televise" 与 "television" 具有相同的词根，而 "telescopic" 与 "telescope" 具有相同的根）。而且，它们在语义上没有关系，它们都是名词。