Is there a word that describes all forms of a root word (not being the past tense or past participle form)? In the instant case, the root word is "compare" and one of the different forms is "comparatively". But I want to refer to all of the different forms that "compare" could take. Please help me.

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    You could speak of derivations, or possibly inflections of the root word, perhaps qualified by an adjective grammatical or conjugative. – WS2 Feb 18 '15 at 17:54
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    Generally the metaphor is that there is one root with several stems. So one speaks of the "perfect stem" or the "present stem" of a particular Latin verb root. E.g, vidē- is the present stem and vīd- is the perfect stem of the verb vidēō, vidēre, vīdī, visum 'see'. – John Lawler Feb 18 '15 at 17:59
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    Inflection : a change in the form of a word that occurs when it has a particular use. – user66974 Feb 18 '15 at 18:02

Technically these are called lexemes or lemmas

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    Welcome to the site. Can you improve this answer by adding any references or examples from actual usage? If not, it may be down-voted or deleted. – cobaltduck Dec 16 '15 at 17:57
  • This is actually the opposite of what is desired. a lexeme (or lemma) is the root itself. The OP is looking for the set of words that come from the one root. – Mitch Dec 16 '15 at 18:35
  • You might coin a term like 'lexical morphate'. Conjugations deal with TAM of verbs and derivations deal with casts between v., n., adj... – AmI Dec 21 '15 at 18:55

Words like 'Accidence', 'declension' or 'conjugation' may be used for derivtional words. Of the three words suggested, the first two may be used for noun derivatives and the last for verb derivatives.

The modulation of a word can well be described by the term, 'inflexion' as well.


Yes, they are called derivatives!

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    Welcome to EL&U. As StackExchange tries to provide definitive answers, I would urge you to edit your post to demonstrate that they are called derivatives; without support— dictionary definitions, examples, linked references— it is simply a statement of your opinion. Please take the site tour and review the help center for additional guidance. – choster Sep 17 '15 at 5:27
  • v. derive - to extract; adj. derivative - [thing] being derived; n. derivation - [thing resulting from] event with deriving {[..] meaning 'optional'} – AmI Dec 7 '15 at 22:19

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