Alter
Alter verb - To make different in some way.
Form
Form verb - Give shape or form to.
Usage example: form the young child's character
Common collocations
Both words in one sentence
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The "alter ego" is her true form, but she's spent most of life in the younger form because she long ago decided that adult society was just too screwed up for her to want any part of.
Source: Sexier Alter Ego -
In addition, a lycanthrope would see its alter ego (e.g., a werewolf in wolf form would see a human and one in human form would see a wolf).
Source: The Mirror Shows Your True Self -
Do note she's 17 years old physically in this form, being an alter-ego of her alien-like form of Nethra, who is actually hundreds, maybe a thousand years old.
Cite this Source
Form and Alter. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/alter/form
Alter & Form. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/alter/form>.
Form or Alter. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/alter/form.
Google Ngram Viewer shows how "alter" and "form" have occurred on timeline