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NLP tasks:

1. Classification taks (e.g. spam detection)
2. Sequence tasks (e.g. text generation)
3. Meaning tasks

A lexical database:

• Nodes are synsets
• Correspond to abstract concepts
• Ployhierarchical structure
  • A polyhierarchical structure is one that allows multiple parents.

According to WordNet which is a large lexical database of English, a synset or synonym set is defined as a set of one or more synonyms that are interchangeable in some context without changing the truth value of the proposition in which they are embedded.

Using WordNet, we can programmatically:

• Identify hyponyms (child terms) and hypernyms (parent terms)
• Measure semantic similarity

The process of classifying words into their parts of speech and labelling them accordingly is known as parts-of-speech tagging, POS-tagging, or simply tagging. Parts-of-speech are also known as word classes or lexical categories.

• POS-tagger processes a sequence of words, and attaches a part of speech tag to each word.
• The collection of tags used for a particular task is known as a tagset.