Morphology is study of the way words are built up from smaller meaning-bearing units called morphemes.
Morphemes consist of 2 parts; stems which are central morpheme of the word, affixes which are adding additional meanings of various kinds.

(ex) cats => cat + -s 

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A lemma is a word that represents a whole group of words, and that group of words is called a lexeme. Lemmatization is the task of determining that two words have the same root, despite their surface differences. For instance, the word 'friends' will become 'friend' and 'worst' will become 'bad'. To start lemmatizing, use:
```python
from nltk.stem import WordNetLemmatizer
```
To lemmatize a sentence, use ```word_tokenize``` first then iterate through the list with a loop.


Lemmatization

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

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