How to find words which are related morphologically?

Question

I'm looking for a book, or any other source, which lists words that are morphologically related, like this:

imagine        verb
imagination    noun
imaginative    adjective

Or this:

medic          noun
medicine       noun
medical        adjective
medicinal      adjective

And also this kind of relationship:

head           noun
ahead          adverb, adjective

Dictionaries will give you only partial information, and in a very inconvenient way.
For example, if you look at the definition of imagination, the words imagine and imaginative are not mentioned there, nor any reference to them. I've checked several dictionaries, and you may be lucky with other ones, but I have not found one which lists all the relevant information in a straightforward manner.

Etymology dictionary is also not suitable for this task. It doesn't give you all the relevant forms of the word, and it does give historical information which is not relevant here.

Mari-Lou A · Accepted Answer

Word by letter

Type the beginning of a word and just see how many results are churned out.

ENGLISH WORDS STARTING WITH "MEDIC"
  
  medic, medicable, medicably, medicaid, medicaids, medical, medically,
  medicals, medicament, medicamental, medicaments, medicant, medicare,
  medicares, medicaster, medicate, medicated, medicates, medicating,
  medication, medications, medicative, medicator, medicean, medicinable,
  medicinal, medicinally, medicine, medicined, medicines, medicining,
  medicks, medico, medicommissure, medicornu, medicornua, medicos,
  medics,

Your Dictionary

Has a more traditional approach but its resources are reliable;
medic

Wordnet Click on any link and all will be revealed. Pretty amazing stuff, I say so myself.
medicine

Word Info has a box with the suffixes and the root word of imagination. Click on imag and imagi and a new page will open with a fair list of derivatives. 
imaginative

image

A reproduction of the form of a person or object, especially a sculptured likeness.
etc..

imageable (adjective)  
imageless
imager
imagery
imaginable (adjective) 
imaginably
imaginant
Imagining
imaginary 
imaginarily
imaginariness
imagination
(list of definitions)
imaginative
(list of definitions)
imaginatively
imagine

Kris · Answer

Generate Derivational Variants, Recursively

medicine|medicality|128|1|R|1|RULE|medical|medicality|$|adj|base|ity$|noun|base|dd|NounAdj|
  medicine|medicative|128|1|R|1|RULE|medicate|medicative|ate$|verb|base|ative$|noun|base|ddddd|NotNounAdj|
  medicine|medication|128|1|R|1|RULE|medic|medication|$|verb|base|ation$|noun|base|ddddd|NotNounAdj|
  medicine|medic|128|1|R|1|RULE|medical|medic|al$|adj|base|$|noun|base|dd|NounAdj|
  medicine|medicant|128|1|R|1|RULE|medic|medicant|$|verb|base|ant$|noun|base|ddddd|NotNounAdj|
  medicine|medicate|1024|1|R|1|RULE|medicable|medicate|able$|adj|base|ate$|verb|base|dddd|NotNounAdj|
  medicine|medic|1024|1|R|1|RULE|medicable|medic|able$|adj|base|$|verb|base|dddd|NotNounAdj|
  medicine|medicinally|2|1|R|1|RULE|medicinal|medicinally|$|adj|base|ly$|adv|base|dd|NotNounAdj|
  medicine|medically|2|1|R|1|RULE|medical|medically|$|adj|base|ly$|adv|base|dd|NotNounAdj|
  medicine|medicinal|1|1|R|1|RULE|medicine|medicinal|e$|noun|base|al$|adj|base|d|NounAdj|
  medicine|medicant|1|1|R|1|RULE|medic|medicant|$|verb|base|ant$|adj|base|ddddd|NotNounAdj|
  medicine|medical|1|1|R|1|FACT|medicine|noun|medical|adj|d|NounAdj|
  medicine|medicable|1|1|R|1|RULE|medic|medicable|$|noun|base|able$|adj|base|ddd|NounAdj|

The link to the java source code is provided on that page; also visit the home page. Can that help?

How to find words which are related morphologically?

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