Demystifying Nouns in Wordnet

WordNet is an excellent resource for all sorts of NLP tasks. Having said that, understanding some of the relationships between terms can be quite difficult. For example, when you are searching for a noun, you are faced with all sorts of relationships such as holonyms, meronyms, hyponyms and meronyms when all that you are looking for is just plain synonyms. In this article, I am going to try to explain some of the relationships for nouns. Please note that this is not WordNet specific, this is more about understanding some basic linguistics.

Relationships in WordNet

  • For nouns: Antonym, Hypernym, Instance Hypernym, Hyponym, Instance Hyponym, Member holonym, Substance holonym, Part holonym, Member meronym, Substance meronym, Part meronym, Attribute, Derivationally related form , Domain of synset (topic, region, usage), and Member of this domain (topic, region, usage). 
  • For verbs: Antonym, Hypernym, Hyponym, Entailment, Cause, Also see, Verb Group, Derivationally related form, and Domain of synset (topic, region, usage). 
  • For adjectives: Antonym, Similar to, Participle of verb, Pertainym (pertains to noun), Attribute, Also see and Domain of synset (topic, region, usage).
  • For adverbs: Antonym, Derived from adjective, and Domain of synset (topic, region,usage)

Hyponyms and Hypernyms

Hyponyms: a word or phrase that is a more specific than the given word.
Hypernyms: a word or phrase that is a more general than the given word. 
Hyponyms have a direct relationship with hypernyms where hyponym is the specific term and hypernym is the more general term. Let us take the word ‘limb’ as an example. What is more specific than limb?

  • arm is a kind of limb
  • leg is a kind of limb
So in this case ‘arm’ and ‘leg’ are the hyponyms and ‘limb’ is the hypernym because arm and leg are the more specific terms in this relationship. Here is a list of hyponyms from WordNet for ‘limb’ in the human limb sense:
Wikipedia article:http://en.wikipedia.org/wiki/Hyponymy_and_hypernymy

Meronyms

Meronyms: something that is part of a larger thing. Let us take arm as an example. What is part of an arm?

  • bicep is part of an arm
  • wrist is part of an arm
Here is a list of meronyms from WordNet for ‘arm’ in the human limb sense:
Wikipedia article:http://en.wikipedia.org/wiki/Meronymy


Holonyms

Holonym: a word that represents the physical whole of a given word. Basically, the opposite of meronyms. Let us take the same arm as an example. What is an arm a part of?

  • an arm is part of a body
  • an arm is part of a human being 
Here is a list of holonyms from WordNet for ‘arm’ in the human limb sense:
Here is another example, for the word ‘toe’. What is a toe a part of?

  • a toe is part of a human foot
That’s all for now!

Have a thought?