The 'form' group
These nouns refer to one form of something.
in embryo in microcosm in miniature in ... form in a ... guise in a ... incarnation
There are serious doubts whether the republics will sign the treaty in its present form.
Jazz comes in many guises.
The effect was of a stately home garden in miniature, charming, but over-fussy for his taste.
Form also has the pattern into N.
The voltage must be measured at regular intervals and converted into digital form.